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BATTERY/STARTING CHARGING SYSTEMS DIAGNOSTICS
8A - 5
(1) Remove both battery cables, negative first. I f
t h e battery has been boosted, charged, or loaded j u s t
p r i o r to t h i s operation, allow t h e battery t i m e to sta-
bilize.
(2) U s i n g a voltmeter connected t o t h e battery
posts, see instructions provided w i t h voltmeter being
used, measure open c i r c u i t voltage (Fig. 8).
This voltage reading w i l l indicate state o f charge,
b u t w i l l n o t reveal c r a n k i n g capacity. Refer t o Bat-
t e r y Open C i r c u i t Voltage chart.
BATTERY OPEN CIRCUIT VOLTAGE
Open Circuit Vohs
P#ra#nt Chorgo
11.7 volts or less
0%
12.0
25%
12.2
50%
12.4
75%
12.6 or more
100%
J908A3
898A-7
Fig. 8 Testing Open Circuit Voltage
BATTERY LOAD TEST
A battery must have t h e c r a n k i n g capacity to sup-
p l y t h e starter motor a n d i g n i t i o n system enough
power to s t a r t t h e engine over a broad range of am-
b i e n t temperatures. A battery load test w i l l
verify
t h e actual c r a n k i n g performance based on t h e cold
crank r a t i n g of the battery.
WARNING: IF BATTERY SHOWS SIGNS OF FREEZ-
ING, LEAKING, LOOSE POSTS, OR EXCESSIVELY
LOW ELECTROLYTE LEVEL, DO NOT TEST. ACID
BURNS OR EXPLOSIVE CONDITION MAY RESULT.
(1) Remove both battery cables, negative first. Bat-
t e r y top a n d posts should be clean. I f green dot is not
visible i n indicator, charge t h e battery, see B a t t e r y
C h a r g i n g Procedures i n t h i s section.
(2)
U s i n g
a suitable Volt-Ammeter-Load
tester
(Fig. 9) connected to t h e battery posts (Fig. 10), refer
to operating instructions provided w i t h the tester be-
i n g used, check t h e open c i r c u i t voltage (no load) o f
the battery. Voltage should be equal t o or greater
t h a n 12.4 volts (Fig. 9) w i t h green dot visible i n test
indicator.
J908A-12
Fig. 10 Volt-Ammeter-Load Tester Connections
(3) Rotate t h e load control knob (Carbon pile rheo-
stat) t o apply a 300 a m p load for 15 seconds to re-
move the surface charge f r o m t h e b a t t e r y and r e t u r n
the control knob to off (Fig. 11).
898A-10
Fig. 11 Remove Surface Charge from Battery
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