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Old 03-11-2006, 05:13 PM
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Alternator Wiring 3-Wire Question



Help. I want to replace my disgusting looking stock alternator on my 72 Nova. It's a 3-wire I guess. There is the threaded terminal on the back of the alternator which is the output I believe, there there is a 2-wire plug connecter interface on the side of the alternator. The alternator has (2) male connectors which mate up with (2) female connectors on the wiring harness plug. I believe this is very common. I have an external voltage regulator on the radiator support panel. When I went to AutoZone to get a new alternator (60 amp) the one they had was exactly the same as mine (which was good) except the (2) male connectors were not at the same height with respect to one another. One was higher. On my existing alternator they are the same height. If I buy that one at Autozone my existing female wire harness will not match up, which means it may not be electrically compatable or do I simply buy a replacement harness to match up with it.

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Old 04-05-2006, 04:04 PM
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Some very good info here
http://www.madelectrical.com/electrical-tech.shtml
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Old 04-05-2006, 05:25 PM
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Doc here,

If you are using the same alternator for your car, look on the back of it, ans see if it say's 1 and 2, or F and R..on the two wire plug..

In fact, If you can snap a picture of it and the one you are going to use, and post it here .. I can tell you more..

Sounds like you may be getting an internal regulated Alternator in place of an external..which will require some changes but will still work.

Doc
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Old 04-06-2006, 08:21 AM
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Quote:
Originally Posted by Triaged
I am checking it out now. thanks for the lead.

Lee
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Old 04-06-2006, 08:26 AM
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Quote:
Originally Posted by docvette
Doc here,

If you are using the same alternator for your car, look on the back of it, ans see if it say's 1 and 2, or F and R..on the two wire plug..

In fact, If you can snap a picture of it and the one you are going to use, and post it here .. I can tell you more..

Sounds like you may be getting an internal regulated Alternator in place of an external..which will require some changes but will still work.

Doc
thanks doc

the car (72 nova) has an external regulator on the radiator support panel. the alternator I got when the car was purchased 2 years ago was the 1 & 2 R & F type like you said. I just bought a 63 amp new one for like $35, that matches that same scheme and installed it. I also put in a new external voltage regulator because they were only like $15. t works ok I guess. the battery voltage is about 14 volts when the car is running. the wiring diagram I have for the 72 nova shows a external regulator and 3-wires at the alternator so I stuck with that scheme.
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