Re: CHECKING CHARGING

Posted by Bob M on March 28, 2003 at 09:41:24 from (165.170.128.66):

In Reply to: CHECKING CHARGING posted by DANWV on March 28, 2003 at 08:38:22:

Dan - Here's how I'd proceed: First, test the ammeter by turning on the ignition or lights with the motor stopped. If the ammeter is working it will indicate -4 amps or so (ignition) or -10 amps or so (lights). If the ammeter stays centered with this test, place a strong magnet close to the ammeter lens. If the ammeter needle now moves away from 0 - which direction doesn't matter - it's wired wrong. And if the needle still doesn't move, it's stuck - time for a new ammeter!

To your other question, you can test the generator by temporarily grounding the generator "F" terminal with the motor running at full RPM. If it now charges (ammeter indicates charge, or a voltmeter across the battery shows 6.8 volts or more) the generator is OK. Problem then is in the regulator or wiring. If grounding the "F" terminal has no effect then the generator is at fault.

Rebuilding a generator depends on the nature of the problem. If it's simply worn out brushes, installing new brushes and polishing the commutator will bring it back. However if the commutator is burned/pitted, or there's an break in a field or armature winding, best take it to an alternator shop for repair - it'll usually cost you less than buying a rebuilt generator.

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