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Old 07-31-2010, 11:24 PM
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Help with wiring an alt in a 50's era car?

The 57' Caddy I just picked up has an alternator just hanging out in the engine compartment. Not wired up and not bolted up right. These originally came with generators correct? So when wiring it up, this alt has the main charge wire, and the two prong flat blade plug. If I remember right, arent these two wires at the plug a field wire and an exciter wire? Where would I wire these up in a car that originally came with a generator?
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Old 08-01-2010, 10:04 AM
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Originally Posted by K and K
The 57' Caddy I just picked up has an alternator just hanging out in the engine compartment. Not wired up and not bolted up right. These originally came with generators correct? So when wiring it up, this alt has the main charge wire, and the two prong flat blade plug. If I remember right, arent these two wires at the plug a field wire and an exciter wire? Where would I wire these up in a car that originally came with a generator?
Thank you
I recently did this swap on my 62 Olds. The first question is, what alternator do you have - internal or external regulator. You want one with an internal regulator, which will have a plug that looks like this:



If so, then the red wire from the plug and the large red wire from the threaded BATT post on the alternator both go to the terminal post on the car. This will likely be on the horn relay. The brown wire from the alternator plug goes to the brown wire to the GEN light on the dash. This wire should be connected to the voltage regulator from the generator if it's still there. That's all there is to it. Just mount the alternator properly and get the right belt and you're good to go.
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Old 08-01-2010, 05:36 PM
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I have the internal regulated alt. Sorry I forgot to mention that. I will check now when I get of in the morning. Just to verify, the red wire from the two wire plug and the red charge wire from the back of the alt both meet up together? Incase the wires at the two wire plug are not color coded properly, is there a leter or identifier next to the prong of the wire on yours that goes either with the charge wire or to the gen light?

Thanks!
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Old 08-02-2010, 08:24 AM
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Quote:
Originally Posted by K and K
I have the internal regulated alt. Sorry I forgot to mention that. I will check now when I get of in the morning. Just to verify, the red wire from the two wire plug and the red charge wire from the back of the alt both meet up together?
Correct. The small red wire from the connector is supposed to run all the way back to the junction block to properly sense voltage drop, but many folks just run it to the threaded BATT post on the alternator itself for simplicity. It will work this way.

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Incase the wires at the two wire plug are not color coded properly, is there a leter or identifier next to the prong of the wire on yours that goes either with the charge wire or to the gen light?
The alternator case should be marked #1 and #2. #1 is the brown wire to the GEN light, #2 is the red wire.
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Old 08-03-2010, 10:03 PM
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I wired it up and charging great! Thanks!
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