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
REV 040116
