E-fan a/c trigger wire 99 Yukon

[skychair]

I've got 1 wire to hook up, but dont know which it is.
From what I've read it is a green wire in the under hood fuse box.
Any one have an idea what wire is correct to trigger Hi speed fans when the a/c clutch engages????
Ron

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[Cokeman95]

I tapped it coming off the compressor. I can get you a picture later.

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[mattillac]

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If I am seeing things correctly here. Looking over a diagram, the dark green wire/third wire up from the bottom left corner of your pic is the "trigger" that leads to the a/c compressor, it should have +12v when the compressor is commanded on.

If you remove the a/c compressor relay from the underhood fuse center there and then remove the plug from the back of the a/c compressor, you could verify the continuity of the dark green wire end to end with a ohm meter.

The back of the a/c compressor relay at the fuse center there should have four wires leading to it:

Pink wire/fourth wire up from bottom left corner of pic - Goes to IGN-E fuse(underhood fuse center)hot in run and start.

Dark green/white wire - Goes to PCM, when required the PCM provides the -12v to the a/c compressor relay(underhood fuse center).

Orange wire - Goes to the a/c comp fuse(underhood fuse center).

Dark green wire/third wire up from the bottom left corner of pic - Goes to the a/c compressor.

Hope that helps.

 

[skychair]

Thanks Guys, I think I got it now.
Ron