Guest 2110A, 2112A, 2111A User Manual
R
Universal Mount
Battery Switch
EASY INSTALLATION
®
Guest selector switches are“make-before-break” single-pole, triple-throw switches that permit the selection between either of two batteries
BATTERY SELECTOR SWITCHES #2110A, #2111A, AND ON-OFF SWITCH #2112A
or banks of batteries, operation of both batteries or banks of batteries in parallel, or complete disconnect of both batteries or banks of batteries.
The switches are rated for 6,12, 24, or 32 volts:
MODEL MOMENTARY CONTINUOUS
2110A 345 230
2111A 345 230
2112A 345
AMPS AMPS
230
NOTE: To maintain listed ratings use 2/0 cable
Model 2110A switch features an alternator field disconnect which interrupts the alternator field when the switch is turned to the“off” position, thus
preventing electrical surges in the armature circuit which might burn out the alternator diodes or ancillary equipment. Models 2111A and 2112A
do not include this feature and should never be turned to the“off” position with engine running.
NOTE: These switches are designed as disconnect switches and are not to be used as load-breaking devices. If switch is used as load-breaking
device in emergency situation (e.g., starter malfunction), the switch should be replaced to avoid possible future failure.
MOUNTING: Switch should be located as close to (within 40”) the batteries as possible. The battery and starter cable should be as short as
possible. Mount on a flat surface in an area that will remain dry and is protected from abuse. OPTIONAL: It may be necessary to remove the
adapter ring on some boats where the battery switch is fed through a thick panelboard.
D
E
G
A
A
T
G
N
D
E
E
T
Y
E
L
N
L
U
F
1
M
BOTH
D
A
T
S
N
I
U.
E
S.
A
.
R
2
OFF
REMOVABLE
ADAPTER RING
WIRING: The battery cable should be sized in accordance with the engine manufacturer’s recommendations. Other guides to wire sizes and
terminals may be obtained from the American Boat and Yacht Council electrical standards. The brass terminal studs for model 2110A, 2111A,
and 2112A are 3/8” diameter. Be sure all connections are securely tightened. Align the terminals such that they do not cause undue twisting at
the switch studs. See wiring diagram below for correct terminal installation. After connecting and mounting of switch, fasten the cables in
position with a suitable cable clamp no more than 6” from the switch. Clamp the remainder of the cable no more than 18” apart.
Note: If the switch is mounted in such a way that the terminals are exposed, then the terminals should be taped or covered in order to comply
with Federal Ignition Protection Codes.
OPERATION: Always reserve one battery for engine starting. Use the second battery for lights, appliances, and other ship’s service.“Both
”
position parallels batteries for emergency use.
CHARGING: Switch setting indicates battery(ies) being charged when engine is running.
CABLE LUG INSTALLATION
Remove Top Nut Only
Removing Bottom Nut Will Damage The Switch
WRONG RIGHT
Tighten nut to 70 in-lbs.
SUGGESTED WIRING DIAGRAM FOR ALTERNATOR FIELD DISCONNECT CIRCUIT
Alternators with EXTERNAL REGULATOR:
Remove regulator field wire (regulator“F” terminal) and connect to new wire leading to Guest battery switch field terminal (either terminal). Add
®
another wire from other switch field terminal and connect to regulator“F” terminal. Use #14 AWG wire for new circuit. Carefully tape
connections for proper insulation.
OR
If it is easier to reach the alternator, remove alternator field wire (alternator“F” terminal) and connect to new wire leading to Guest battery switch
®
field terminal (either terminal). Add another wire from other switch terminal and install to alternator“F” terminal. Use #14 AWG wire for new circuit.
Carefully tape connections for proper insulation. Note:
The function of #2110A selector switch will not be affected if the field circuit disconnect
feature is not used.
WIRING CHANGE AT ALTERNATOR
BATTERY SWITCH
FIELD
NEW WIRES
TO SWITCH
#14 AWG
B
ALTERNATOR
REMOVE
WIRE
CONNECTION
TO
F
REGULATOR
EXISTING
WIRES
GUEST
2110A
BATTERY SWITCH
WIRING CHANGE AT REGULATOR
REGULATOR
FIELD
#14 AWG
REMOVE
WIRE
F B A
CONNECTION
TO
ALTERNATOR
EXISTINGNEW WIRES
WIRESTO SWITCH
Alternators with INTERNAL REGULATOR:
OR
The field circuit wire on alternators with internal regulators is located within the alternator housing and it is impractical to use the field disconnect
feature. Protection of the alternator diodes can be achieved by installing a Guest Isolator #2401A (for 70 ampere alternators) or other appropriate
®
model.
See below for various wiring diagram for alternators with internal regulator:
1-ALTERNATOR 2-BATTERIES
1-SWITCH
ALTERNATOR
STARTER
ENGINE
GUEST
SWITCH
2110A
FEED
B1 B2
BATTERY
1
F
B
REG
F
BATTERY
2
2-ALTERNATORS 2-BATTERIES
2-SWITCHES
ALTERNATOR ALTERNATOR
F
B
REG
F
STARTERSTARTER
ENGINEENGINE
1-ALTERNATOR 3-BATTERIES
2-SWITCHES
ALTERNATOR
F
STARTER
ENGINE
B1 B2
BATTERY
1
FEED
STARTING
BATTERY
BATTERY
GUEST
SWITCH
2110A
F
B
REG
F
B
REG
F
FEED
B1 B2
2
BATTERY
GUEST
SWITCH
2110A
3
GUEST
SWITCH
2110A
FEED
B1 B2
STARTING
BATTERY
GUEST
SWITCH
2110A
SHIP SERVICE
BATTERY
FEED
B1 B2
LOAD
12 VOLT
2655 Napa Valley Corporate Drive
Napa, CA 94558
Tel: (707) 226-9600
Fax: (707) 226-9670
website: www.marinco.com
08/02 201001
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