CTEK MUS 4.3, 1065 User Manual

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MANUAL

INTRODUCTION

MUS 4.3 (1065) is a switch mode charger with both float 
and pulse maintenance and is a part of a series of bat tery 
chargers from CTEKSwedenAB. These chargers represent the 
latest technology within battery charging. A MUS 4.3 (1065) 
gives the battery maximum life.

CTEK C OMFORT CONNECT – eyelet ¼” (M6)

MODE

RECOND

12V/4.3A

MUS 4.3

CTEK C OMFORT CONNECT

MAINS CABLE

CTEK C OMFORT CONNECT – c lamp

CHARGE CABLE

SUPPLY PLUG*

*Supply plugs may differ to suit your wall socket.

IMPORTANT SAFETY
INSTRUCTIONS

CALIFORNIA PROPOSITION 65

WARNING: This product contains chemical known to the state 
of California to cause cancer or reproductive toxicity.

1. 

SAVE THESE INSTRUCTIONS 

– This manual contains important safety and operating  
instructions for battery charger model MUS 4.3 (1065).

2.  Do not expose charger to rain or snow.

3.  Use of an attachment not recommended or sold by CTEK 
may result in a risk of  fire, electric shock or injury to 
persons.

4.  To reduce risk of damage to electric plug and cord, pull 
by the plug rather than cord when disconnecting charger.

5.  An extension cord should not be used unless absolutely 
necessary. Use of improper extension cord could resu lt 
in a risk of fire and electric shock. If an extension cord 
must be used, make sure that: a) Pins on plug of exten­sion cord are the same numb er, size and shape as those 
of plug on charge r; b) Extension cord is properly wired 
and in good electrical condition; and c) Wire size is large

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enough for AC ampere rating of charger as specified 
in “RECOMMENDED MINI MU M AWG SIZE FOR AC 
EXTENSION CORDS”.

6.  Do not operate charger with damaged cord or plug – 
return the c harger to the retailer.

7.  Do not operate charger if it has received a sharp blow, 
been dropped or otherwise damaged in any way ; take it 
to the retailer.

8.  Do not disassemble charger;  take it to the retailer when 
service or repair is required. Incorrect reassembly may 
result in a risk of electrical shock or fire.

9.  To reduce risk of electric shock, unplug charger from AC 
outlet before attempting any maintenance or cleaning.

10. 

WARNING - RISK OF 
EXPLOSIVE GASES

a)  WORKING IN VICINITY OF 

A LEAD-ACID BATTERY IS 
DANGEROUS. BATTERIES 
GENER ATE EXPLOSIVE GASES 
DURING NORMAL BATTERY 
OPERATION.  FOR THIS

REASON, IT IS OF OU TMOST 
IMPORTANCE THAT YOU 
FOLLOW THE INSTRUCTI ONS 
EACH TIME YOU USE THE 
CHARGER.

b)  To reduce risk of battery explosion, follow these instruc-

tions and those published by the battery manufacturer 
and the manufacturer of any equipment you intend to use 
in vicinity  of  battery. Review cautionary marking on these 
products and on engine.

11.  

PERSONAL PRECAUTIONS

a)  Consider having someone close enough by to come to 

your aid when you work near a lead-acid battery.

b)  Have plenty of fresh water and soap nearby in case bat-

tery acid contacts skin, clothing or eyes.

c)  Wear complete eye protection and clothing protection. 

Avoid touching eyes while working near battery.

d)  If battery acid contacts skin or clothing, wash immedi-

ately with soap and water. If acid enters eye, immediately 
flood eye with running cold water for at least 10 minutes 
and get medical attention immediately.

e)  NEVER smoke or allow a spark or flame in  vicinity of bat-

tery or engine.

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f)  Be extra cautious to reduce risk of dropping a metal tool 

onto battery. It might spark or short-circuit battery or 
other electrical part that may cause explosion.

g)  Remove personal metal items such as rings, bracelets, 

necklaces, and watches when working with lead-acid 
battery. A lead-acid battery can produc e a short-circuit 
current high enough  to weld a ring or the like to metal, 
causing a severe burn.

h)  Use charger for charging a LEAD-ACID battery only. It is 

not intended to supply power to a low voltage electrical 
system other than in a starter-motor application. Do not 
use battery charger for charging dry-cell batteries that 
are commonly used with home appliances. These batter­ies may burst and cause injury to perso ns and damage to 
property.

i)  NEVER charge a frozen battery.

12. 

PREPARING TO CHARGE

a)  If necessary to remove  battery from vehicle to charge, 

always remove grounded terminal from battery first. 
Make sure all accessories in the vehicle are off, so as not 
to cause an arc.

b)  Be sure area around battery is well  ventilated while bat-

tery is bein g charged. 

c)  Clean battery terminals. Be careful to keep corrosion 

from coming in contact with eyes.

d)  Add distilled water in eac h cell until battery acid reaches 

level specified by battery manufacturer. Do not overfill. 
For a battery without removable cell c aps, such as valve 
regulated lead acid batteries, carefully follow manufac­turer’s recharging instruction.

e)  Study all battery manufacturer’s specific precautions 

while charging and recommended rates  of  charge.

f)  Determine voltage of battery by referring to car ow ner’s 

manual and make sure it matches output rating of battery 
charger.

13.  CHARGER LOCATION

a)  Locate charger as far away from battery as DC cables 

permit.

b)  Never place c harger directly above battery being 

charged; gases f rom battery will corrode and damage 
charger.

c)  Never allow battery acid to drip on charger when read-

ing electrolyte specific gravity or filling batter y.

d)  Do not operate charger in a closed-i n area or restrict 

ventilation in any way.

e)  Do not set a battery on top of charger.

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14.  DC CONNECTION 

PRECAUTIONS

a)  Connect and disconnect dc output clips only after setting 

any charger switches to “off” positi on and removing AC 
cord from electric outlet. Never allow clips to touch each 
other.

b)  Attach clips to battery and chassis as indicated in 15(e), 

15(f), 16(b) through 16(d).

15. 

FOLLOW THESE STEPS WHEN 
B ATTERY IS INSTALLED IN 
VEHICLE. A SPARK NEAR 
B ATTERY MAY CAUSE BATTERY 
EXPLOSION. TO REDUCE RISK 
OF A SPARK NEAR BATTERY:

a)  Position AC and DC cords to reduce risk of damage by 

hood, door or moving engine part.

b)  Stay clear of fan blades, belts, pulleys, and other parts 

that can cause injury to persons. 

c)  Check polarity of battery posts. POSITIVE (POS, P, +) 

battery post usually has larger diameter than NEGATIVE 
(NEG, N, -) post.

d)  Determine which post of batte ry is grounded (connected) 

to the chassis. If negative post is grounded to the chassis 
(as in most vehicles) see (e). If positive post is groun ded to 
the chassis, see (f).

e)  Fo r Negative-grounded vehicle, connect POSITIVE 

(RED) clip from battery charger to POSITIVE 
(POS, P, +) ungrounded post of battery. Connect 
NEGATIVE (BLACK) clip to vehicle chassis or engine 
block away from battery. Do not connect clip to carbure­tor, fuel lines, or sheet-metal body parts. Connect to a 
heavy gage metal part of the frame or engine block.

f)  For Positive-grounded vehicle, connect NEGATIVE 

(BLACK)  clip from battery charger to NEGATIVE 
(NEG, N, –) ungrounded post of b attery. Connect 
POSITIVE (RED) clip to vehicle chassis or engine block 
away from batt er y. Do not connect clip to carburetor, 
fuel lines, or sheet -metal body parts. Connect to a heavy 
gage metal part of the fra me or engine block.

g)  When disconnecting charger, turn switches to off, discon-

nect AC cord, remove clip from vehicle chassis, and then 
remove clip from battery termi nal.

h)  See operating instructions for length of charge 

information.

16. 

FOLLOW THESE STEPS WHEN 
B ATTERY IS OUTSIDE VEHICLE. 
A SPARK NEAR BATTERY MAY

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CAUSE BATTERY EXPLOSION. 
TO REDUCE RISK OF 
A SPARK NEAR BATTERY:

a)  Check polarity of battery terminals. POSITIVE (POS, 

P, +) battery post usually has a larger diameter than 
NEGATIVE (NEG, N, -) post.

b)  Connect POSITIVE (RED) charger clip to POSITIVE (POS, 

P, +) post of batter y. 

c)  Posi tion yourself and free end of cable as far away from 

battery as possible – then connect NEGATIVE (BLACK) 

charger clip to NEGATIVE (NEG, N, -) post of battery.
d)  Do not face battery when making the final connection.
e)  When disconnecting charger, always do so in reverse

sequence of connecting procedure and break first con-

nection while as far away from battery as practical.
f)  A marine (boat) battery must be removed and charged

on shore. To charge it on board requires equipment spe-

cially designed for marine use.

IMPORTANT SAFETY
INFORMATION!

• Ch arge no other batteries than specified in TECHNICAL 
INFORMATION.

• Check t he charger cables prior to  use. Ensure that no 
cracks have occurred in the cables or in the bend protec­tion. A charger with damaged cables must be returned to 
the retailer.

• Ensure that the cabling does not jam or comes into contact 
with hot surfaces or sharp edges.

• Never charge a damaged battery.

• Never place the charger on top of the battery when 
charging.

• Avoid covering the charger. 

• All batteries fail sooner or later. A battery that fails dur­ing charging is normally taken care of by the chargers 
advanced control,  but some rare errors in the battery could 
still exist.  Don’t leave any batter y d uring charging unat­tended for a longer period of time.

• If power consumers like fitted alarms and navigation com­puters are connected to the battery, the charging process 
takes longer and may drain the batt er y.

• Always check that the charger has switched to STEP 7 
before leaving the charger unattended and connected for 
long periods. If the charger has not switched to STEP 7 
within 50 hours, this is an indication of an error. Disconnect 
the charger.

• Batteries consum e water during use and charging. For b at­teries where water can be added, the water level should 
be checked regularly. If the water level is low add distilled 
water.

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• This appliance is not designed for use by young  children or 
people who cannot read or understand the manual unless 
they are und er the supervision of a responsible person to 
ensure that they can use the battery charge r safely. Store 
and use the battery charger out of the reach of children, 
and ensure that children cannot play with the charger.

• Connection to the mains supply must be in accordance with 
the national regulations for electrical installations.

• Do not extend the charge cable.

RECOMMENDED
MINIMUM AWG SIZE
FOR AC EXTENSION CORDS

LENGTH OF CORD

FEET (M)

AWG SIZE OF CORD

25 (7.6 ) 18

50 (15.2) 18
100 (30.5) 18
150 (45.6) 16

CONNECT AND
DISCONNECT THE
CHARGER TO A BATTERY

+

+

–

–

Comfort
Connect

MODE

RECOND

12V/4.3A

MUS 4.3

Comfort
Connect

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OPERATING INSTRUCTIONS

1. Connect t he charger to the battery.

2. Connect the charger to the wall socket. The power lamp will indicate t hat the mains cable is connected 
to the wall socket. The error lamp will indicate if the battery clamps are incorrectly connected. The 
reverse polarity protection will ensure that the battery or cha rger will not be damaged.

3. Press the MODE -button to select charging program.

4. Follow the 8-step display through the charging process.   
The battery is ready to sta rt the engine when STEP 4 is lit.  
The battery is fully charged when STEP 7 is lit.

5. Stop c harging at any time by disconnecting the mains cable from the wall socket. 

SMALL 

BATTERY 

PROGRAM

ERROR LAMP

NORMAL 

BATTERY 

PROGRAM

FULLY CHARGEDREADY TO USE

POWER L AMP

MODE BUTTON

MODE

RECOND

12V/4.3A

MUS 4.3

COLD 

WEATHER 

PROGRAM

RECOND 

PROGRAM

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CHARGING PROGRAMS

Settings a re made by pressing the MODE-button. After about two seconds the charger activates the selected program. The 
selected program will be restarted next time the charger is connected.

THE TABLE EXPLAINS THE DIFFERENT CHARGING PROGRAMS:

PROGRAM BATTERY SIZE (AH) EXPLANATION TEMP RANGE

1. 2–14A h

Small battery program

14.4V/0.8A. Use for smaller batteries.

-4ºF–122ºF

(-20°C–+50°C )

14–160 Ah

Normal battery program 

14.4V/4.3A. Use for WET batteries, Ca/Ca, MF, GEL batteries 
and many AGM batteries.

41ºF–122ºF 

(+5°C–+50°C)

14–160 Ah

Cold weather program 

14.7V/4.3A . Use for charging at low temperature s and for 
power AGM batteries like Optima and Odyssey.

-4ºF–41ºF

(-20°C–+5°C)

RECOND

14–160 Ah

Recond program

15.8V/1. 5A.  Use to return energy to the empty WET and Ca/Ca 
batteries. Recond your battery once per year and after deep 
discharge to maximise lifetime and capacity. The Recond pro­gram adds STEP 6 to the normal battery pro gram. Frequent use 
of the Recond program may cause water loss in the batteries and 
reduce service life of electronics. Contact your vehicle and bat­tery supplier for advice.

-4ºF–122ºF

(-20°C–+50°C )

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DESULPHATION SOFT START BULK ABSORPTION ANALYSE RECOND FLOAT PULSE

CURRENT (A)       VOLTAGE (V)

15.8V 0.8A until 12.6V Increasing volt­age to 14.4V. 

0.8A

Declining cur­rent. 14.4 V

Checks if volt­age drops to 
12V

13.6V

0.8A

12. 7 V–14 .4V

0.8–0.4A

15.8V 4.3A until 12.6V Increasing volt­age to 14.4V. 

4.3A

Declining cur­rent. 14.4 V

Checks if volt­age drops to 
12V

13.6V

4.3A

12. 7 V–14 .4V

4.3–2A

15.8V 4.3A until 12.6V Increasing volt­age to 14.7V.  

4.3A

Declining cur­rent. 14.7V

Checks if volt­age drops to 
12V

13.6V

4.3A

12.7V–14.7V

4.3–2A

RECOND

15.8V 4.3A until 12.6V Increasing volt­age to 14.4V. 

4.3A

Declining cur­rent. 14.4 V

Checks if volt­age drops to 
12V

Max 15.8V

1.5A

13.6V

4.3A

12. 7 V–14 .4V

4.3–2A

Limit:

Max 8h Max 8h Max 20h Max 10h 3 minutes

30 min or 4h 
depending 
on battery 
voltage

10 days.
Charge cycle 
restarts if volt­age drops

Charge cycle 
restarts if volt­age drops

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READY TO USE

The table shows the estimated time for empty battery to 80% 
charge

BATTERY SIZE (AH) TIME TO 80% CHARGED

2Ah 2h

8Ah 8h
20Ah 5h
60Ah 15h

110A h 28h

STEP 1 DESULFATION

Detects sulfated batter ies. Pulsing current and voltage, 
removes su lfate from the lead plates of the battery restoring 
the battery capacity.

STEP 2 SOFT START

Tests if the battery can accept charge. This step prevents that 
charging proceeds with a defect battery.

STEP 3 BULK

Charging with maximum current until approximately 80% bat­tery capac ity. 

STEP 4 ABSORPTION

Charging with declining current to maximize up to 100% b at­tery capac ity.

STEP 5 ANALYSE

Tests if the battery can hold charge. Batteries that can not 
hold charge may need to be replaced.

STEP 6 RECOND

Choose the Recond program to add the Recond step to the 
charging process. During the Recond step voltage increases 
to create controlled gassing in the battery. Gassing mixes the 
battery acid and gives back energy to the battery.

STEP 7 FLOAT

Maintaining the battery voltage at maximum level by provid­ing a constant voltage charge. 

STEP 8 PULSE

Maintaining the battery at 95–10 0%  capacity. The charger 
monitors the battery voltage and gives a pulse when neces­sary to keep the battery f ully charged.

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ERROR LAMP

If the error lamp is lit, check the following:

1. Is the chargers positive lead connected
to the battery’s positive pole?

2. Is the charger connected to a 12V
battery?

3. Has charging been interrupted in STEP
1, 2 or 5?

Restart the charger by pressing the MODE­button. If charging is still being interrupted, the 
battery...
STEP 1: ...is seriously sulfated and may need to 
be replaced.
STEP 2: ...can not  ac cept charge and may 
need to be replaced.
STEP 5: ...can not keep charge and may need 
to be replaced..

MAINTENANCE
INSTRUCTIONS

The MUS 4.3 (1065) is maintenance-free. The charger must 
not be opened; doing so will invalidate the warranty. If the 
power cable is damaged the charger must be returned to the 
retailer. The charger casing can be cleaned using a damp 
cloth and mild cleaning agent. Remove the plug from the 
power socket before cleaning.

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TECHNICAL SPECIFICATIONS

Charger model MUS 4.3
Model number 1065
Rated Voltage AC 110 –12 0V AC ,  50–60Hz
Charging voltage

14.4V,    14.7 V,  15.8V
Min battery voltage 2.0V
Charging current 4.3A
Current, mains 1.1A r ms (at full charging current)
Back current drain* <1Ah/month
Ripple** <4% of rated current
Ambient temperature - 4°C to +122°F (-20˚ to +50˚C), output power is reduced automatically at high temperatures
Charger type  Ei ght step, fully automatic charging cycle
Battery types All types of 12V lead-acid batteries (WET, MF, Ca/Ca, AGM and GEL)
Battery capacity 1. 2–110 A h , up to 160Ah for maintenance
Dimensions 6½ x 2½ x 1½ inches (L x W x H) 
Weight 1.4 Ibs

*) Back current drain is the current that drains the battery if the charger is not connected to the mains. CTEK chargers has a very 
low back current.
**) The quality of the charging voltage and charging cur rent is very important. A high current ripple heats up the battery which 
has an aging effect on the positive electrode. High voltage ripple could harm other equipment that is connected to the battery. 
CTEK battery chargers produce very clean voltage and current with low ripple.

20016551B MUS 4.3 NG, Manual, Print file 002.indd 12 2011-12-02 14:21:24

 EN • 13

EN

LIMITED WARRANTY

CTEK PowerInc, issues this limited warranty to the original 
purchaser of this product. This limited warranty is not transfera­ble. The warranty ap plies to manufacturing faults and material 
defects for 5 years from the date of purchase. The customer 
must return the product together with the recei pt of purchase 
to the retailer. This warranty is void if the battery charger has 
been opened, handled carelessly or repaired by anyone 
other than CTEK PowerInc or its authorised representatives. 
CTEK PowerInc makes no warranty other than this limited 
warranty and is not liable for any other costs other than those 
mentioned above, i.e . no consequential damages. Moreover, 
CTEK PowerInc is not obligated to any other warranty other 
than this warranty.

CTEK PRODUCTS ARE
PROTECTED BY

2011 - 0 9 - 1 9

PATENTS DESIGNS TRADE MARKS

EP10156636.2 pending

RCD 509617

CTM 669987

US12/7809 68  pending

US D575225

CTM 844303

EP1618643

US D571179

CTM 372715

US7541778

US D580853

CTM 3151800

EP1744432

US D581356

CTM 1461716 pending

EP1483817 pending

RCD 321216

CTM 1025831

SE524203

RCD 000911839

CTM 405811

US7005832B2

RCD 081418

CTM 830545751 pending

EP1716 626 pending

RCD 001119911-0001

CTM 1475420 pending

SE 5266 31

RCD 001119911-0002

CTM 1935061 pending

US 76 3 8974B 2

RCD 081244

V28573IP00

EP19 03658 pending

RCD 321198

CTM 1082141 pending

EP 09180 286. 8 pending

RCD 321197

CTM 2010004118 pending

US12/646405 pending

ZL 200830120184.0

CTM 4-2010-500516 pending

EP1483818

ZL 200830120183.6

CTM 410713

SE1483818

RCD 000835541-0001

CTM 2010/05152 pending

US 76 29774B2

RCD 000835541-0002

CTM1042686

EP09170640.8 pending

US D596126

CTM 7668 40 pending

US12/564 360 pending

US D596125

SE528232

RCD 001705138-0001

SE525604

US D29/378528 pending
RCD 201030618223.7 pending

20016551B MUS 4.3 NG, Manual, Print file 002.indd 13 2011-12-02 14:21:24

14 • EN

SUPPORT

CTEK offers a professional customer support: www.ctek.com. 
For latest revised user manual see www.ctek.com. 
By e-mail: [e-mail], by telephone: (330) 963 - 0981, 
by fax [phone]. 
By mail: CTEK PowerInc, 
2374 Edison Blvd. Twinsburg
OH 44087-2376 US

Bengt Hagander, President
CTEK SWEDEN AB

20 0165 51B

20016551B MUS 4.3 NG, Manual, Print file 002.indd 14 2011-12-02 14:21:24

 FR • 1

FR

MODE D'EMPLOI

INTRODUCTION

Le chargeur MUS 4.3 (1065) est un chargeur de batterie 
en mode commuté avec fonction d'entretien et d'entretien 
par impulsion qui fait par tie de la gamme de chargeurs 
de batterie à la pointe de la technologie proposés par 
CTEKSwedenAB. Le chargeur MUS 4.3 (1065) optimise la 
durée de vie de la batterie.

CTEK C OMFORT CONNECT – eyelet ¼” (M6)

MODE

RECOND

12V/4.3A

MUS 4.3

CTEK C OMFORT CONNECT

CORDON

D'ALIMENTATION

CTEK C OMFORT CONNECT – c lamp

CÂBLE DE CHARGE

FICHE

D'ALIMENTATION*

*Le type de fiche d'alimentation peut varier en fonction de votre prise murale.

CONSIGNES DE SÉCURITÉ
IMPORTANTES

PROPOSITION 65 DE LA CALIFORNIE.

MISE EN GARDE: Ce produit co ntient des substances 
chimiques reconnues par l'État de Californie comme étant 
cancérigènes ou toxiques pour la reproduction.

1. 

CONSERVEZ CES 
CONSIGNES

– Ce mode d'emploi contient 
des consignes de sécurité et des directives d'utilisation 
importantes pour le chargeur de batteries MUS 4.3 
(1065).

2.  Ne pas exposer le chargeur à la pluie ou à la neige.

3.  Ne pas utiliser d'accessoires non recommandés ou 
vendus par CTEK pour éviter tout risque d'incendie, 
d'électrocution ou de blessure.

4.  Pour éviter d'endommager les câbles, débrancher le 
chargeur en retirant la fiche sans tirer sur le cordon 
d'alimentation.

5.  Ne pas utiliser de rallonge, sauf nécessité absolue. 
L'utilisation d'une rallonge inappropriée pourrait 
entraîner un risque d'incendie ou d'électrocution. Si 
l'utilisation d'un e rallonge est nécessaire, vérifier les 
points suivants: a) les broches de la fiche de la rallonge

20016551B MUS 4.3 NG, Manual, Print file 002.indd 1 2011-12-02 14:21:25