Just installed a new Chevy 350 in my truck, went to break it in and my voltage gauge was reading 11 volts. Voltmeter on the battery registered 11, and 14.7 at the back of the alternator. Figured it was a bad connection on the frame rail, since it was dirty, so I made a new one and went to drive the truck to an exhaust shop. Volt gauge read 11.5 and dropped to 8 within ten miles, engine died of course. Put cables on it, jump started it and it was reading 12.2 at the battery, and at the post on the back of the alternator, so the connection is good between the battery and alternator. I suspect one of 2 things: Field wire, we weren't picking up voltage on the field wire. Anybody know where that taps into the junction or fuse block? Ground, I believe these alternators are internally grounded, but is there a chance that the powdercoated accessory brackets keep it from grounding to the engine block? We took the alternator off and tested it by the way, it passed all 3 tests at Autozone. Any suggestions? I'm trying to find info on where the field wire is routed, so I can check for fusible links or loose connections anywhere. Maybe it's as simple as a fuse blown in the fuse block. I'll take a look tomorrow when I go to the exhaust shop, but if anybody's had this problem before I'd appreciate some help. Thanks.