I'm the third owner of a non-running '52 8N. It has a 10DN Delco alternator with the tiny regulator, making it one wire. It was hooked up POSITIVE ground. I got it running and nothing out of the alternator. I had PM Electric in Hayden, Colorado, check things out, and he said it was indeed set up for positive ground. It had the yellow wire, which is for an idiot light, going directly to the battery side of the solenoid, the black ground wire to the output terminal of the alternator, and nothing else hooked to the output. It would not work wired this way. I disconnected the yellow wire and let it dangle, and ran a wire from the output terminal to the solenoid, and it works well. I've been working on machines and such for over 60 years, and this is the first Delco I've seen positive ground. Don't worry about the starter and solenoid - they work no matter what way you have it set up. If the ammeter reads backward, reverse the wires.
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