1J-2 Charging System:
Battery Runs Down Quickly
B837H11A04002
Troubleshooting
Battery overcharges Faulty regulator/rectifier. Replace.
Faulty battery. Replace.
Poor contact of generator lead wire
coupler.
Repair.
Battery runs down quickly Trouble in charging system. Check the generator, regulator/rectifier and
circuit connections and make necessary
adjustments to obtain specified charging
operation.
Cell plates have lost much of their active
materials a result of overcharging.
Replace the battery and correct the charging
system.
Internal short-circuit in the battery. Replace the battery.
Too low battery voltage. Recharge the battery fully.
Too old battery. Replace the battery.
Battery “sulfation” Incorrect charging rate. (When not in
use battery should be checked at least
once a month to avoid sulfation.)
Replace the battery.
The battery was left unused in a cold
climate for too long.
Replace the battery if badly sulfated.
Condition Possible cause Correction / Reference Item
Step Action Yes No
1 Check accessories which use excessive amounts of
electricity.
Are accessories being installed?
Remove accessories. Go to Step 2.
2 Check the battery for current leakage. Refer to “Battery
Current Leakage Inspection (Page 1J-3)”.
Is the battery for current leakage OK?
Go to Step 3. • Short circuit of wire
harness.
• Faulty electrical
equipment.
3 Measure the regulated voltage between the battery
terminals. Refer to “Regulated Voltage Inspection (Page 1J-
3)”.
Is the regulated voltage OK?
• Faulty battery.
• Abnormal driving
condition.
Go to Step 4.
4 Measure the resistance of the generator coil. Refer to
“Generator Inspection (Page 1J-3)”.
Is the resistance of generator coil OK?
Go to Step 5. • Faulty generator coil.
• Disconnected lead
wires.
5 Measure the generator no-load performance. Refer to
“Generator Inspection (Page 1J-3)”.
Is the generator no-load performance OK?
Go to Step 6. Faulty generator.
6 Inspect the regulator/rectifier. Refer to “Regulator / Rectifier
Inspection (Page 1J-10)”.
Is the regulator/rectifier OK?
Go to Step 7. Faulty regulator/rectifier.
7 Inspect wirings.
Is the wirings OK?
Faulty battery. • Short circuit of wire
harness.
• Poor contact of
couplers.
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