Heavy Load Test; Specific Gravity; Trouble Diagnosis - Jeep J-10 Series 1982 Technical & Service Manual

10-6 BATTERIES
amperes until 3 consecutive specific gravity tests, at
one-hour intervals, are constant.
If the cell variation is more than 50 points (0.050) at
the end of the charge period, replace the battery.
When the specific gravity of all cells is above 1.235
and variation between cells is less than 50 points, the
battery may be tested under load.
Specific Gravity
State of Charge
Specific Gravity
(Cold and Temperate Climates)
Fully Charged
75% Charged
50% Charged
25% Charged
Discharged
1.265
1.225
1.190
1.155
1.120
60340
Heavy Load Test
NOTE: The Jblfowing instructions refer to Amserv
Buttery-Alternator-Regulator Tester, Model 21-307.
(1) Before performing heavy load test, battery must
be fully charged. Refer to Slow Charge.
(2) Turn carbon pile rheostat knob of battery tester
to OFF position (fig. 1D-3).
(3) Turn selector knob to AMP position.
(4) Connect test leads as illustrated in figure 1D-3.
(5) Turn carbon pile rheostat knob clockwise until
ammeter indicates correct test amperage:
• 135 amperes for 55-380 battery (75 reserve capacity
minutes, 380 cold crank amps).
• 180 amperes for 56-450 battery (90 reserve capacity
minutes, 450 cold crank amps).
• 230 amperes for 24-440 battery (135 reserve capacity
minutes, 440 cold crank amps).
^^^^
AMP,
o o o o o o
Rg. 1D-3 Heavy Load Test
SELECTOR
KNOB
CARBON PILE
RHEOSTAT
KNOB
42144
(6) Maintain load for 15 seconds. Turn selector
switch to VOLTS, and note voltage.
If the voltmeter indicates 9.6 volts or higher with the
battery temperature at a minimum of 70°F (21°C), the
battery is in good condition. If less than 9.6 volts, replace
the battery.
TROUBLE DIAGNOSIS
When an engine will not start because the starter
motor is inoperative, follow the steps outlined in the
DARS charts to determine if the battery or the starting
system is the cause of the malfunction.
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