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Message: [QUOTE="bad12jr, post: 515252, member: 1001"] Hey guys, Having a weird problem on the SD. Has the dual alternator setup from the factory. Had a charging issue about 3 weeks ago. Had remanufactured alternators which I in the past have had horrible luck with. So i remove them and take them to a local rebuilder who had always done great work for us. Well now it appears that the upper alternator or both have quit? Does anyone have a schematic or test procedure for the dual setup. Checking the wiring in the harness appears good. The harness on the upper is reading 10.8 v DC on one pin and .143 v AC or so on the other pin. Need to check the lower but need a longer set of test leads for my meter so as to not get burnt. Will the dual setup turn on the lower alternator if the upper quits? Just checked the system last night as I have everyweek till I get a voltmeter for the cab in just to keep an eye on it. It was putting out 13.6 volts and everything was fine. Only aux power draw is a 800 watt kenwood amp hooked to two 8'' subs and the headlights are wired through relays with just the switch turning the relay on. I'm out of ideas at the moment. Without a schematic I'm at a standstill. Done a good bit of electrical troubleshooting in college and while working on small engines so nothing new. Sorry for the long post but appreciate the help. Thanks [/QUOTE]

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