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Old May 8th, 2007, 13:05
DaffyXJ's Avatar
DaffyXJ DaffyXJ is offline
NAXJA Member #929
 
Join Date: May 2003
Location: southern MD
Posts: 1,030
Re: Electric Fan OverRide Switch

I don't see that there is a difference....
1) tap into the 12 v wire at the electric fan. run 10/12ga wire to a relay, attach to pin 87.
2) Run 10 ga wire from pin 30 to battery.
3) Run ga wire of your choice (say 16/18 ga) from switched 12v source to pin 85 or 86 of relay.
4) Run similiar sized 16/18 ga wire from ground to your new switch, then from switch to the unused 85 or 86.
Done!
When you turn on the switch the relay passes 12V B+ to the fan and it runs. When you turn switch off, fan waits for factory signal path to send 12V to fan and it runs.
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