Sniper electric fan wiring
I'm attaching a drawing for this, in case it might be useful to some. I got the info from a Holley instruction sheet that comes with their fan wiring kit, basically a relay and some wires. I already had a box of relays. The wiring colors on the drawing are for my setup; others may differ. The concept of switching the relay with ground rather than +12 is really strange to me. I'm guessing it has to do with how the EFI controller internals work.