Cen C850 - Advanced Troubleshooting (CONTD); Chart 2: Test OVCO Circuit

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TG97A
Section C: Advanced Troubleshooting (CONT'D)
Chart 2: Test OVCO Circuit
Yes
No
1. Unplug alternator-to-regulator harness from regulator.
2. Connect DMM red lead to harness plug socket B.
3. Connect DMM black lead to harness socket 2. Does resistance read 1.0-1.5 ohms?
Alternator is faulty
Replace existing regulator with known good regulator. Run engine. Does OVCO trip?
Yes
No
Alternator is faulty
Yes
No
1. Connect DMM red lead to harness plug socket 2.
2. Connect black DMM lead to alternator B– terminal. Does resistance read <1 ohm?
Alternator is faulty
Original regulator is faulty
Yes
No
1. Unplug alternator-to-regulator harness from regulator.
2. Connect DMM red lead to harness plug socket C.
3. Connect DMM black lead to harness socket 2. Does resistance read 1.0-1.5 ohms?
Alternator is faulty
Ifyouhavequestionsaboutyouralternatororanyofthesetestprocedures,orifyouneedtolocateaFactoryAuthorizedServiceDistributor,pleasecontactusat:
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