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The Fitech efi system offers a black wire that allows for a programmable bump in rpm’s with compressor activation also offers a yellow wire with a programmable electric fan activation at a pre-set coolant temperature...

I have been using the yellow wire to trigger a fan relay and it works great. Now I’m trying to get the black wire to do its job but I need an A/C ground and I am not sure where to find one. I see that the A/C binary switch can be replaced with a trinary that will send a ground signal but it makes sense that I should also tie it into the fan relay to activate the fan as well...

If I just tie the grounds together I’m afraid that I will bump my rpm’s upward every time the electric fan comes on...which would be ok but no ideal.

Has anyone recently tackled this idea ...?
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