GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

Wiring Efans

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Old Mar 18, 2007 | 03:41 AM
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Default Wiring Efans

Hey guys,,, i got some PCM pins now..

I want to wire my Efans to the PCM..

How are yall wiring them to come on when the A/C is on?
White1 might can help... he PM me months ago, but i deleted all my PMs and forgot to save that one..

How many Relays? 3?
Is Pin 42 a Ground or a 12+volt?

And i want to have a Manual Override so i can turn them on or off if need be.
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Old Mar 21, 2007 | 08:42 PM
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anybody have any insight on this????
i think i can get away with 2 relays..
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Old Mar 22, 2007 | 09:20 PM
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You can 2 or 3, just depends on what you want.

schematics are here: http://s2.photobucket.com/albums/y28.../ElectricFans/
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Old Mar 23, 2007 | 10:57 AM
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Pin 42 is a ground. For a/c you want to tap into the a/c clutch wire in the large harness that runs down next to the aux power box on the driver's side of the engine.
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