Originally Posted by HiProfile

From what I see in Helms, the rad fan circuit basicly runs through fuses #41/80amp and #33/15amp, then to ground. The relay that it run the +12v through is connected to ignition +12v and GND via thermo switch and the ecu's A12. I have no idea off hand what that relay is rated for, I'm guessing 15A. Most Spals are over 15A.

Assuming you don't have Hybrid's electrical issues, all you really need is a relay hooked to the rad fan connector, one wire to a +12vdc source (spal power), and one to ground (spal GND). In this case since its a relay feeding a relay, you don't need diodes since there's no complete solid-state circuit to feedback on when the coil collapses & spikes. Since Hybrid's setup runs the coil directly off two relatively sensitive switches, he needs the diodes to prevent harming them.

So for a working fan setup, it should be:

BLK/RED (rad fan connector) = 86
BLK (rad fan connector) = 85
user's 20A fused +12vdc = 30
user's wire to SPAL Red/+12vdc = 87
SPAL Black/GND = Chassic Ground

No diodes absolutely needed since the coil draws very little energy, and almost any spike would be w/in the stock relay's specs (far less than the stock fan itself). BTW the 20A supply doesn't have to be to switched +12v for this config, since the stock relay already is. Hybrid's bypasses it, thus his need.