so i had the ka-t s12 running then i realized that i needed to hook up the electric fan.... so i took the signal and tapped it into the black red wire on the engine harness. not to take power but to operate the relay. problem is now i no longer have power to the ecu when i crank just like before. the wire that runs to the b/w wire ath the coil is still hooked up and still has power it just wont supply it to the ecu. help what could i have screwed up where are all the relays and fuses taht control this?

Well first things first, disconnect it from the engine harness. You don't want the fan or relay to be running of that power at all.

Are you going for a fan constantly running? That will kill your alternator pretty quick. But if you hook it up into a switch, or a temperature switch (my setup), I just put it directly to the battery and fused it. Mine's automatic, So I don't have to worry about drain or forgetting it. It was simple to make a switch coupling (used an old sentra switch) and use a relay.

alreaddy did all that and i still have no power when i crank... hummm

fixed delete it was the little plug on the battery that had come lose and i couldnt tell so it runs great