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EFV-8 Club Forum / General Ford Discussion / 1940 generator wiring

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Discussion Topic: 1940 generator wiring

moldmaker

02-08-2010 @ 2:49 PM

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After recently rebuilding the original flathead in my 1940 coupe, I am not sure what wire connects to the lower side stud on the generator. The upper side stud is stamped 'Field' and is connected to a wire in the wiring harness, however the lower stud is not stamped. There was a jumper wire from this stud to a screw on the carburetor when I disassembled things, however I am sure that this is not correct. I am assuming it is for a ground to somewhere. There is no wire that I can find out of the harness to connect to this. Maybe incorrect generator for this year? Any advise would be helpful.

40guy

02-08-2010 @ 5:43 PM

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You do in fact have the wrong generator. A 40" generator has only two posts total; one on the side and one on the back. Sounds like you have a 46-48 unit which will work on the 40, just don't hook anything to the bottom side post.

alanwoodieman

02-09-2010 @ 5:22 AM

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you are correct in assuming that it was a ground, not really needed as the other gentleman said. 40 gens only had two wires.

deluxe40

02-09-2010 @ 10:52 AM

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Be aware that the generator does need a ground through the case, bracket and intake manifold. I just had a car that quit charging when I changed a fan belt because the bracket and manifold had previously been painted and didn't ground well in their new position.

moldmaker

02-09-2010 @ 5:09 PM

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Thanks for the input guys. I will be sure to have good
bare metal contact through case and bracket.

supereal

02-10-2010 @ 9:15 AM

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One of the biggest problems with old cars is poor grounding. I'd put a separate ground wire between the generator and regulator "just in case". Some regulators have a ground lug, others use a brass ferrule in one of the mounting feet.

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