Posted by Gene Davis (Ga.) on January 17, 2008 at 19:43:38 from (75.104.46.36):
On my standby generator I have a 1SI Delco alternator that is wired with the battery wire to the rear post and the 2 small wires of the plug on the side connected to the ignition switch. It has worked well for about 10 years and suddenly last time I used it the alternator would not charge. Did the old trick of inserting a drill bit in the case to ground the regulator test tab and it charged like the proverbial scalded ape and when I removed the drill bit it did not charge. Supposedly that meant the regulator is bad, finally after much looking found a regulator in a parts store, most of them want to sell a whole rebuilt alternator instead of a part to repair it. Installed the regulator in about 45 minutes time and cranked it back up. Same thing again, charge with tab grounded and no charge if not grounded. Had another good alternator, took the regulator out and changed it in to this one and same story, Did this with a third regulator and the same old story. Any body know whart might be going on here??
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