3 wire alternator plug two wire harness no upgrade
10

Asked by Jackieboy3691 Jan 02, 2021 at 05:20 PM about the 1999 Cadillac DeVille Sedan FWD

Question type: Maintenance & Repair

I'm changing out my alternator and pigtail on my
99 deville, the harness has two wires and the one
from the part store has three  what do I do with
the third larger wire?

4 Answers

F_O_R answered 3 years ago

Either get the correct alternator or get a conversion plug.

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Jackieboy3691 answered 3 years ago

It's is the correct alternator for my car, amperage and pulley size are the same the aftermarket plug is the difference,the extra wire on the 4pin connector is for S which I believe is the exciter, do I nee to run that as an exciter or can I clip it off the plug, alternator is the cs series

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157,505

James answered 3 years ago

All the ones I'm seeing have the 3 than 1 plugs hook up. I wouldn't be cutting and splicing anything at the alternator unless the plug was burned. Take a picture of the plugs you have back to the store. Something isn't right! Hope that helps! Jim

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19,475

Jason answered 3 years ago

positive , negative and chassis ground. you need to find out what are the wires on both sides to hook up in this case.best to find the proper alternator if possible.

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