Where is your voltage regulator? Some were on the back of the generator that year and some were the external ones with four terminals. If you have the external one, unplug it and jump terminals "I" and "A" together with a jumper wire in the connector. That's the two on the ends of the plug. Run the engine at idle just long enough to see what the battery voltage comes up to. Don't raise engine speed too much if at all because system voltage can go dangerously high. If the voltage goes to around 15 volts or more, clean the regulator's housing where it bolts to the body, and if that doesn't help, replace it.

If you have the regulator bolted to the back of the generator, check out this page for the test method. You'll be doing the same thing as in the previous test. It's called "full-fielding" the system.

Answered by caradiodoc (expert)
17,643 answers provided

ALTERNATOR - MODELS W/EXTERNAL REGULATOR ?
ALTERNATOR - MODELS W/INTEGRAL REGULATOR ?

Which one do you have? Could be at the starter relay or from alternator to battery

Answered by rasmataz
68 questions asked

Regulator Bypass test:

Answered by rasmataz
68 questions asked