Battery Overcharges
- Check Voltage Drop
Measure voltage drop between positive battery terminal and Yellow/White wire at generator 3-pin harness connector. If voltage drop is less than 0.5 volt, replace voltage regulator. If voltage drop is 0.5 volt or greater, repair Yellow/White wire for high resistance or open. Restore electrical connections and check system operation.
- Check Battery Voltage
Start engine. Turn off all accessories. Increase engine speed and measure voltage at battery. If battery voltage remains less than 15 volts, go to next step. If voltage increases to 15 volts or greater, go to step 6
.
- Check Generator Voltage
Turn engine off. Measure voltage at generator terminal "F". See Figure
. If battery voltage does not exist, go to next step. If battery voltage exists, go to step 5
.
- Check For Grounded Slip Ring
Disconnect 3-pin and 1-pin harness connectors from generator. Remove voltage regulator from generator. Measure resistance between ground and each slip ring. If resistances are 10,000 ohms or greater, replace voltage regulator. If resistance is 10,000 ohms or less, replace generator. After repair, check system operation.
- Check Indicator Light Operation
Start engine. Increase engine speed. Using DVOM, measure voltage increase and observe indicator light operation. If voltage increases to greater than 15 volts or indicator light flickers, repair Yellow/White wire and/or Light Green/Red wire as necessary. If voltage remains less than 15 volts and indicator light does not flicker, replace generator. After repair, check system operation.
- Check Regulator Operation
With engine running, monitor voltage at generator terminal "F". Increase engine speed. If voltage increases as engine speed increases, replace voltage regulator. If voltage does not increase as engine speed increases, replace generator. After repair, check system operation.