Chrysler RAM TRUCK 2500 1994 Service Manual page 321

J948A-13
Fig 8 Volt-Ammeter-Load Tester Connections
turn control knob to O F F (Fig. 9). This will remove
the surface charge from the battery.
898ArlO
Fig. § Remove Surface Charge from Battery
(4) Allow the battery to stabilize to open circuit
voltage (may take up to 5 minutes).
(5) Rotate the load control knob to maintain a load
(50% of cold crank amperage rating—see Specifica­
tions) for a minimum of 15 seconds (Fig. 10). After 15
seconds, record the (loaded) voltage reading and re­
turn the load control to OFF
898Arll
(6) Voltage drop will vary according to battery tem­
perature at the time of the load test. Battery temper­
ature can be estimated by the ambient temperature
over the past several hours. If the battery has been
charged, boosted, or loaded a few minutes prior to
test, the battery would be somewhat warmer. Refer
to Load Test Temperature chart for proper loaded
voltage reading.
(7) If the voltmeter reading fell below 9.6 volts,
with the battery temperature at a minimum of 70°F
(21°C), replace the battery.
LOAD TEST TEMPERATURE
Minimum Vbhoge
Temperature
Minimum Vbhoge
P C°
9.6
70 and above 21 and above
9.5 60 16
9.4 50
10
9.3 40
4
9.1 30
- 1
8.9 20
-7
8.7 10
- 1 2
8.5
0 -18
J908A-4
BATTERY CHARGING
A battery is completely charged when it has:
• an open circuit voltage of 12.4 volts or more.
• has enough cranking capacity (minimum 9.6 volts
when loaded for 15 seconds to 50% of cold crank am­
perage rating at 21°C (70°F).
A green test indicator on the top of the battery, in­
dicates the battery is charged enough for further
testing. A black indicator means the battery state-of-
charge is below 75%. A yellow or bright indicator
means the battery has low electrolyte level. The bat­
tery cannot be refilled or charged, it must be re­
placed.
WARNING: DO NOT C H A R G E A BATTERY THAT
HAS LOW E L E C T R O L Y T E L E V E L BATTERY MAY
A R C INTERNALLY AND E X P L O D E .
WARNING: E X P L O S I V E G A S E S FORM O V E R BAT­
TERY, DO NOT S M O K E , U S E F L A M E , OR C R E A T E
S P A R K S NEAR BATTERY.
WARNING: DO NOT A S S I S T BOOST OR C H A R G E A
F R O Z E N BATTERY, CASING MAY F R A C T U R E .
Fig. W Load 50% Cold Crank Rating Note Voltage