Model: MJTEST
Made in China
Read Instructions
Before Operating
USE ONLY AS DIRECTED
DO NOT DISCARD IN FIRE
KEEP OUT OF REACH OF CHILDREN
AVOID EXCESSIVE HEAT EXPOSURE
Vehicle LCD Battery / Charging System Tester Manual
100%
75%
50%
25%
BATTERY STATE OF CHARGE
VOLTS 12.0 12.2 12.4 12.6
Operating voltages and amperage rating 9-16 V | 1 A
ELECTRICAL CONTACT END
Inserts into power receptacle
PIVOTING HEAD
TESTING MODES
Pivots for easy viewing
and angle adjustment
Alternator Mode |Battery Mode
12.80
YELLOW LED
RED LED
GREEN LED
VOLTAGE READING
Refer to Battery State of
Charge Chart for voltage
reading levels
CHARGE GRAPH
Indicates good test result
Indicates bad test result
Alternator Test: 15.11 - 16 V
Battery Test: 11.99 - 0 V
Indicates potential problem or low voltage
Alternator Test: 14.51 - 15.1 V
Battery Test: 12.00 - 12.6 V
Displays the measured voltage
to indicate battery charge level
Alternator Test: 13.51 - 14.5 V
Battery Test: 12.61 - 13.5 V
Battery Monitor Results:
Low battery voltage (yellow or red LED)
is not always due to a dead battery.
It could be an indication of several things,
including, but not limited to:
• Possible problem with the alternator
• Dirty battery terminals
• Extreme outside temperature
• Undercharged battery
NOTE: WHILE ENGINE IS RUNNING VOLTAGE METER WILL
MEASURE ALTERNATOR VOLTAGE. NORMAL READINGS
FOR STANDARD ALTERNATORS RANGE FROM 13.5 - 14.5 V.
PARTS DIAGRAM:
Customer Service
1-888-784-2835
cs@viatek.com
REV 040116
USE ONLY AS DIRECTED
DO NOT DISCARD IN FIRE
KEEP OUT OF REACH OF CHILDREN
AVOID EXCESSIVE HEAT EXPOSURE
USE:
To use the Battery Charging System Monitor, please follow the included instructions and refer to these tips.
CAUTION
• Keep away from children.
• Remove any jewelry before working on vehicle’s battery.
• Use as intended only.
• Inspect before every use. Do not use if damaged.
• Remove product from power receptacle when not in use.
Model: MJTEST
Made in China
Read Instructions
Before Operating
Vehicle LCD Battery / Charging System Tester Manual
Battery Test Mode (Range: 0 - 13.5 Volts)
1. With vehicle turned off, insert the electrical contact end of the tester into cigarette lighter socket or power receptacle.
2. Turn key ignition to accessory power. Battery / charging system tester should display results.
(For vehicles with push button start, press the start button without engaging the brake.)
Understanding Battery Test Results
Good Battery Test Result
Green LED Illuminated | Voltage Range: 12.61 - 13.5 Volts | Charge Graph: 5 Bars +
Indicates Good Battery
Bad Battery Test Result
Yellow or Red LED Illuminated | Voltage Range: 0 - 12.6 V | Charge Graph: 0 - 4 Bars
Indicates Possible Battery Problem - Charge or replacement may be necessary
Proceed to steps below to test alternator. This may help to determine if problems exist with the battery, alternator, or
possibly both.
Alternator Test Mode (Range: 13.51 - 16 Volts)
1. Insert the electrical contact end of the tester into cigarette lighter socket or power receptacle.
2. Turn engine on and leave running (If engine does not start or does not continue to run, consult automotive technician).
Understanding Alternator Test Results
Good Alternator Test Result
Green LED Illuminated | Voltage Range: 13.51 - 14.5 V
Indicates alternator is charging battery and powering electrical system.
Bad Alternator Test Result
Yellow or Red LED Illuminated | Voltage Above or Below Target Range of 13.51 - 14.5 V
Indicates alternator is overcharging or undercharging system, or there could be other electrical problems.
Consult automotive technician.
Customer Service
1-888-784-2835
cs@viatek.com
REV 040116
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