What alternator wiring can I lose?

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chaos19810
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What alternator wiring can I lose?

Post by chaos19810 » 26/01/20 17:41

Hello,

It’s good to be working in my car again, I’m in the current process of requiring the car with a stand-alone, but the wiring from the 3sgte and the car harness have both had a hard life so I an in the process of making a new engine harness.

I’m pretty much planned and sorted all of it but I have three wires from the alternator plug which I am not totally sure what to do with them. I know that

1) Charge warning light, Yellow - doesn't do much just a warning light on dash

So not needed, but I can trace the wire to the dash if needs be

2) ECU-IG, 7.5A, Black Yellow - fuse located in Engine Bay (also in ABS circuit)

I’m not sure what to do with this but I think it needs a 12v feed, as I’m using a different coil set I can just run a feed from my new ford coil

3) Alt Sencing, 7.5A, White/Red - fuse located in frunk

I don’t know what this one does my research has thrown up nothing conclusive does anyone have any idea?

Thanks



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jimi
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Re: What alternator wiring can I lose?

Post by jimi » 26/01/20 21:24

One is the warning light, one is the battery sensing and one is an ignition switched live. Yours will be type3 or type4 (round or rectangular)
alternator_connections_002.gif
Denso3.gif

Personally I would rewire it the same as Mr T did, it was wired the way it was for good reasons.
Given the MR2's propensity to have alternator problems, why do away with the charge warning light? as a professional chief electrician / MR2 enthusiast that makes no sense whatsoever to me ;)
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Topic author
chaos19810
Posts: 980
Joined: 29/09/11 18:00
Gender: Male
Years of MR2 Ownership: 2
MR2's Owned: 3
Location: Bury st edmunds
Contact:

Re: What alternator wiring can I lose?

Post by chaos19810 » 27/01/20 17:59

If I’m honest, the wiring was a mess, it had been chopped and changed to fit in 4 different cars, plus now it’s in the Aw11 I want to tidy it all up and start getting rid of wires that I now longer need. The engine will be controlled by the standalone loom, I have already planned the starter circuit, it was the charging circuit to sort then next Sunday I start building.

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