polarity question
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
polarity question
i have a 49 f-1 that was converted to 12v pos ground many years ago. we would like to convert it to neg ground. a gen rebuilder one time told me my gen was a '57 ch**y gen. i know that i would have to reverse the batt cables, coil wires, any other access with + and - connections, etc. and reverse the wire in the ammeter. from the info i have given, can anyone tell me what to do with the gen and regulator? i've read a couple of diff procedures and don't know which one might apply. thanks for the read. dick r.
Fleet Owner
Joined: Jul 2004
Posts: 27,298
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From: NM
You'll need to match the gen to a 12v neg grnd regulator. I know there are different types of regulators in the late '50's, but I don't know exactly which is which. Is it mounted on your flatty just like the original? If you pull it off, and look around on it, you should see either Ford or Delco-Remy markings. Once you know what make/model it is, it's pretty straightforward to match it up to a reg. The differences have to do with what is grounded and where. About all I know is that the wrong reg will smoke off in about 20 seconds and could take the gen out with it. I have a Motor Manual from the '50's, if you give me the #'s I can probably identify it for you.
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
ross, thanks for the resp. my truck is at my brother in laws and i won't be going up until next sunday. i'll def get the info and post it. don't want to cook anything. dick r.
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
back with info
ok, ross, here's what we have. the regulator in the stock location, it's a delco remy. the numbers on it are 1118 838F 12vp, the terminals are bat. gen. and f. does this relate to anything you know of?? thanks for your help now and at many times in this project. dick r.
Fleet Owner
Joined: Jul 2004
Posts: 27,298
Likes: 1,059
From: NM
Well, I can't find that number exactly listed for any GM, Rambler or other car, but numbers close to it are 50's. All are for generators with external ground for the field and all after '53 are shown to be for 12v negative ground systems?! I thought GM was 6v, pos ground til about '56 too?
It says the procedure for polarizing is: With all wires from gen to reg connected, momentarily jumper Gen terminal to Bat terminal on regulator.
I would assume all you need to do is swap battery wires, and re-polarize. Good luck!
Edit: That "P" at the end of your number bothers me; maybe it is a special model for positive ground? So here's a common 30 amp negative ground number that will work if you want to try getting a new one: '62 Chevy V8 reg #1119001. It was used for 4-5 years on many GM cars.
It says the procedure for polarizing is: With all wires from gen to reg connected, momentarily jumper Gen terminal to Bat terminal on regulator.
I would assume all you need to do is swap battery wires, and re-polarize. Good luck!
Edit: That "P" at the end of your number bothers me; maybe it is a special model for positive ground? So here's a common 30 amp negative ground number that will work if you want to try getting a new one: '62 Chevy V8 reg #1119001. It was used for 4-5 years on many GM cars.
Last edited by ALBUQ F-1; Jan 25, 2008 at 08:58 AM.
