3-30 Engine Electrical Industrial 1.6L
Battery Charging
Basic Rules
When charging the battery, follow these basic rules:
• Use a charger with an end of charge voltage of
16.0 volts. The charger should have a voltmeter
that is accurate within 1 percent.
• Ambient temperature should be 15-38°C (60-
100°F). An extremely cold battery may not
accept measurable current after several hours
of charging.
• The charging area should be well ventilated.
On batteries with a built-in hydrometer:
• Do not charge the battery if the built–in
hydrometer is clear or light yellow (3). If crank
ing problems exist, replace the battery.
• Do not charge a battery that seems to be
frozen. Replace the frozen battery.
• A battery with a green dot showing in the
hydrometer (1) does not require charging
unless the battery has been discharged, such
as from cranking.
Charging Procedure
Caution: Refer to Battery Cautions on page 3-9.
Notice: Always turn the ignition OFF when connecting
or disconnecting battery cables, battery chargers, or
jumper cables. Failing to do so may damage the
Electronic Control Module (ECU) or other electronic
components.
Important: Tighten the adapters against the lead
terminals of the battery in order to keep the resistance
between the adapters and the battery terminals to a
minimum.
1. Make sure all connections to the charger are clean
and tight. When charging side terminal batteries
out of the equipment, install a pair of GM P/N
12303040 adapters.
Important: Do not use the charger settings for jump–
starting equipment in order to charge the battery.
2. Set the charger for 12–volt batteries that gives the
highest charge rate.
NOTE: On batteries with a built in hydrometer,
charge the battery until the green dot (1) appears.
• Check the battery periodically while charging.
• Lightly tap the hydrometer on top in order to
dislodge any air bubbles that may prevent a
correct indication.
3. Discontinue charging, or reduce the charging rate,
if the following apply:
• The battery feels hot, above 52°C (125°F)
• Violent gassing or spewing of electrolyte
through the vent holes
After charging, test the battery. Refer to Battery Not
Operating Properly and Battery Electrical Drain/
Parasitic Load.
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