Mechanics

WHAT DO THE WIRE COLORS ON ALTERNATOR WIRE HARNESS MEAN ?

1988 Honda Prelude • 240,000 miles

Took my jdm 3 pin alt plug off harness and spliced a 4 wire usdm(i think) plug to 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? I didnt have the money to buy an oem alt from parts store so im trying to work with what I got?
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King8657
May 19, 2012.



It goes back to the computer-see below


Rasmataz
May 19, 2012.
So on my carbed prelude will this alternator work? If so then where should I connect or splice the extra red/white wire to make it work? Should I just leave it hanging?


Tiny
King8657
May 19, 2012.
You can ignore it-and check the running voltage of the alternator if its correct


Rasmataz
May 19, 2012.
On my other post about this problem they said it wont work. So will the fi alt still work on my carb prelude?


Tiny
King8657
May 19, 2012.
The wire you refering to goes back to the computer as indicated in the picture which controls the alternator's field generation circuit-


Rasmataz
May 19, 2012.
So will it work without that wire plugged into anything


Tiny
King8657
May 19, 2012.
As mentioned in the earlier question, it will not work as designed, I feel that it will do one of two things, not work at all or go to an over charge state, which can do serious damage to electrical systems, the colour coding is just to distinguish which wire goes where on the schematic, I would suggest that you get your old alt overhauled and avoid the possibility of doing any damage.


Mhpautos
May 20, 2012.