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What wires should I splice together to make this alternator work?

Tiny
KING8657
  • MEMBER
  • 1988 HONDA PRELUDE
  • 240,000 MILES
I removed my 3 wire alternator from my carbureted prelude and took my 3 wire alt plug off of the harness put in a 4 plug alt in and spliced the 4 wire plug to my 3 wire harness. Wire colors on my harness are black/yellow. Blue/white. And green/white. Those wires match up so I spliced those to the plug, but there is extra red/white wire hangin. What do I do with it? What do the colors mean and what is their function? Where should I splice the extra red/white wire to make my alternator work?
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Saturday, May 19th, 2012 AT 9:13 AM

4 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
What car did the replacement alt come off model and year if you can.
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Saturday, May 19th, 2012 AT 9:24 AM
Tiny
KING8657
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  • 10 POSTS
I think it was a 1989 or 1990 prelude 2.0si . All I know is that 4 pin alt is fuel injected and my car is carbed.
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Saturday, May 19th, 2012 AT 9:40 AM
Tiny
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I will see what I can find out
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Saturday, May 19th, 2012 AT 9:42 AM
Tiny
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According to the schematics for both alternators they are not compatible, the extra wire goes to a integrated control unit that is not fitted to your earlier model.
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Saturday, May 19th, 2012 AT 9:53 AM

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