Check a wiring diagram before taking my word for it. But I think this
is how it went.
Looking down into the relay's socket, the wire connected to the socket
pin most aft passenger side is the trigger (see attached mini diagram).
I believe it's a ground completion type circuit. Which means to
activate, ground the wire; to de-activate let it float. So a switch
that connects the trigger to ground should do it.
Check and test things out with a multimeter. Keep in mind the relay is
powered by the ignition, not always hot. So you'll have to have the
ignition on at least.
And another thing. Pulling the relay will trip a check engine light
that needs to be reset.
Laters,
Jay W
505/287 Dakota
Bill Pitz wrote:
> On Sat, 23 Aug 2003 17:02:51 -0400, woodrufj@yahoo.com (Jayson
> Woodruff) wrote:
>
>
>>Alright, here's what I did. On my 4.7L I pulled out the mechanical
>>clutch fan and wired my fog lamp switch as an additional trigger to the
>>electrical fan. From what I understand the E-fan will come on when the
>>AC compressor is on and if the temp gets over 220ish. But otherwise I
>>can manually switch the fan on from inside.
>>
>>This should free up a little HP, lighten up the fron end and give me a
>>toggle for the fan (handy for ideling inline to race). Most I've heard
>>is the 4.7 doesn't overheat with out the mechanical fan. I'm going to
>>go test it now by driving (crawling) over the Sepulveda pass in 93+ degs.
>>
>>Later things to do is make a 180ish deg trigger for the fan and change
>>out the T'Stat to 180.
>
>
> Hey Jay,
>
> What wire did you tap into and run to your foglamp switch? I've been
> thinking that it would be nice to have a manual override on the
> electric fan (separate switch, maybe even under the dash somewhere) so
> that I can kick it on when I'm sitting in traffic in the heat.
>
> -Bill
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