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Undercharged battery
This condition, as evidenced by slow cranking or low specific
gravity can be caused by one or more of the following conditions
even though indicator lamp may be operating normal.
Following procedure also applies to cars with voltmeter and
ammeter.
• Make sure that undercharged condition has not been caused
by accessories left on for extended period of time.
• Check drive belt for proper tension.
• If battery defect is suspected, refer to "Battery Description" in
this section.
• Inspect wiring for defects. Check all connections for tight-
ness and cleanliness, battery cable connections at battery,
starting motor and ignition ground cable.
NO-LOAD CHECK
1) Connect voltmeter and ammeter as shown in the figure.
NOTE:
Use fully charged battery.
1. Generator
2. Ammeter (between generator (B) terminal and battery (+) terminal)
3. Voltmeter (between generator (B) terminal and ground)
4. Battery
5. Load
6. Switch
2) Run engine from idling up to 2,000 rpm with all accessories
turned off and read meters.
If voltage is higher than standard value, check ground of
brushes.
If brushes are not grounded, replace IC regulator.
If voltage is lower than standard value, proceed to following
check.
Specification for undercharged battery (No-load check)
Current: 10 A
Standard voltage: 14.2 – 14.8 V at 20°C (68°F)
NOTE:
Consideration should be taken that voltage will differ
somewhat with regulator case temperature as shown in
the figure.
A: Regulated voltage (V)
B: Heatsink temperature (°C)
CHARGING SYSTEM 6H-7
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