12
Operating Instructions BC5500B
Charging More than One Battery
Passenger vehicles and light trucks with diesel engines may use
two batteries. Heavy-duty trucks, special service vehicles, some
agricultural and industrial equipment may use two or more
batteries. Charge multiple batteries up to 12 volts.
Batteries may be charged in a group if:
• Wired in parallel with the positive terminal of one battery
connected to the positive terminal of the remaining
battery(ies) and the negative terminals connected to negative
terminals.
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Charging time is twice as long for a group of batteries
wired in parallel as a single battery.
• Wired in series with the positive terminal connected to
negative terminal between batteries; and the voltage of all
batteries combined is 12 volts, i.e. two 6 volt batteries.
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If one battery of a parallel or series group is charged and
another is discharged, isolate the battery(ies) and charge
separately.
Cranking Assist
Use this procedure to help the battery crank the engine over in
a vehicle with a discharged battery.
• Use only on batteries in good condition.
• Do not use if the battery has been discharged for a long
period of time, since it may be sulfated.
1. Turn off all accessories and lights.
2. Connect clamps to battery terminals. For additional
information refer to
Safety Information–Charging
Instructions
.
3. Plug charger power cord into properly grounded 120 VAC
outlet.
4. Set Length of Charge Timer to HOLD.
5. Charge battery for five minutes.
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Partially charging battery helps direct more power
to starter motor during cranking assist.
6. Crank engine.
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Cranking assist is provided for approximately 5
seconds followed by a 120 second cool down.
Although most starter motors can withstand
cranking for 15 seconds, the charger only provides
cranking assist for 5 seconds before cool down is
required.
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