snomobeelr Posted June 12, 2022 Share Posted June 12, 2022 71 Monte. Ive been running an internal voltage regulator for years. No external Regulator. Had existing alternator rebuilt and new pully put on. I also changed the 2 prong plug as the old wouldn't clip in. Everything ran fine. Car - engine was cold and I was checking the belt and put my hand on the alternator and it was hot. Not warm, hot and motor was cold. I unplugged the two wire plug came out the next morning alternator is cold. I plugged back in the two wire plug. Let it sit car wasn't started /run at all. I came out 30 to 45 minutes later and the alternator was warm , generating heat!! Key off. Using multimeter set at 20. The white wire in clip no voltage. The blue/red wire 15.40. The single post Battery on alternator 15.53. The Battery itself 15.65. Either I wired the two prong clip wrong. FLIPPED THE WIRES. Or its an issue with the Alternator. I thought it would be like 12.5 with car off at the Alternator and 12.6 at battery? Am I using the multimeter correctly ? Quote Link to comment Share on other sites More sharing options...
snomobeelr Posted June 12, 2022 Author Share Posted June 12, 2022 My bad. Battery in Multimeter needed changed... Checked agian Alternator - White wire on two wire plug = 00.2/00.4 Key off Alternator - White wire on two wire plug = 11.79 Key on Alternator - Blue/White wire on two wire plug = 11.84 Alternator - Terminal with Red wire = 11.84 Battery - 11.82 Quote Link to comment Share on other sites More sharing options...
snomobeelr Posted June 12, 2022 Author Share Posted June 12, 2022 I cant remember when I removed the voltage regulator and added the Jumper to use the Alternator with the internal voltage regulator. If I had used a diode. When I changed the plug I didn't use a diode. And of course , I can't find the old one I cut out to check... So I wonder if that is the reason it gets hot when car is off? Or if its just me. 1 Quote Link to comment Share on other sites More sharing options...
71MonteCarloMD Posted June 20, 2022 Share Posted June 20, 2022 Not sure if the jumper wires are hooked correctly? Quote Link to comment Share on other sites More sharing options...
Searsman Posted June 21, 2022 Share Posted June 21, 2022 From looking at the wiring schematic I think your wires are jumped incorrectly..from the schematic it should be blue to brown, not blue to red... also should be white to red, not white to brown... Ron 1 Quote Link to comment Share on other sites More sharing options...
Dtret Posted June 21, 2022 Share Posted June 21, 2022 I agree with what Ron said. Based on the schematic you provided. 1 Quote Link to comment Share on other sites More sharing options...
1970mcss Posted June 21, 2022 Share Posted June 21, 2022 Ditto what these guys said Quote Link to comment Share on other sites More sharing options...
snomobeelr Posted June 24, 2022 Author Share Posted June 24, 2022 Update, when I put the new plug on I flipped the leads. I changed 1 to white and 2 to Red and that was it. Jeez I created a mess . Thanks everyone !! 1 Quote Link to comment Share on other sites More sharing options...
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