[BonzoHansen]

Good. You just need to use the wires that ran from the ECM to the relay for the trigger circuit(s).

Simplest way: Get a fan switch, put it in the side of the RH head, connect the lead from the new f/s to the ECM wires at the relays - the 1 wire will splice to both --> "Y". I believe you should still have power at the relay (trigger & feed). If the trigger hots were cut then you'll have to run IGN power to them.

You could also run each fan on different switches for a lower & higher temp setup. Best is add a 3rd realy and run both at 6 volts from a lower temp switch and both at 12v off a higher temp switch. How complicated do you want to get?

Do you have AC? Do you want a manual override switch?

What car/year/engine are the 2 harnesses (TBI & TPI) you have from? I will look it up & draw a pic for you by Sunday night.

Cut as little from the ECM harness as possible (resale value)!