Re: Windstar dual electric fan wiring... Relay sizes?
Nice wiring diagram Jeff.
And those 4th gen F-body are very versatile.
I like the GM way of wiring them. The load is split between two smaller fuses, wires and relays and there's no dropping resistor. The Ford way uses a 50 amp fuse and I'm sure a pretty thick feed wire. I actually drew out and used the series/parallel relay setup in the 80's, before GM used it.
With the GM method, unless things really heat up, the fans stay in low speed (running in series with fans at half speed) with minimal current load.
Folks, don't forget an at least 100 amp alternator when using electric fans.
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1971 Monte Carlo SS454-496ci 600hp
1999 Trans Am-500hp
2003 Iszu Ascender XL Limited V8