All right boys and boys, I finally wired a switch to control the stock auxiliary electric fan. The way the fan turns on normally, the pcm provides a ground for the aux fan relay, which then provides voltage to the fan. The pcm engages the ground when the temp hits 217*(according to my 96 fsm) or when the a/c compressor is engaged(a/c or defrost mode). Basically you have a switch with input side grounded and the output side will go to the aux fan relay @ the pdc on pass side fender. On my 96, the aux fan relay ground wire is Dark Blue w/ Pink stripe(DB/P). I removed the PDC to get access to the wiring underneath the relays. Now with the switch on, the fan will be on continuously until you turn of the ignition. With the switch off, the fan will turn on when it normally does. It uses existing fuse and relay.
Now on my brother's 95 dual e-fan setup, he used a second relay for the second fan and had it engaged by the 12v output of the first relay(his doesn't get too hot so if it ever hits 217 or the ac is on, both fans will engage simultaneously. Here's some of his pics:
Now on my brother's 95 dual e-fan setup, he used a second relay for the second fan and had it engaged by the 12v output of the first relay(his doesn't get too hot so if it ever hits 217 or the ac is on, both fans will engage simultaneously. Here's some of his pics:
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