Hi all, long time lurker and I have learned a lot from this board, but this time I couldn't find the answer.

I need help trying to figure out what type of diode I need to install in my project car. I am wiring up a derale-16749 fan controller, and it has a single override wire on it. I am trying to use that wire to trigger the fans when the AC is turned on, but also use a switch to be able to activate the fans manually (car comes with a fan switch stock, would be nice for it to be functional).

I wired it all up and activating the manual fan switch turns on the fans, and of course also engages the AC clutch.

The car is Pantera, and has funky italian wiring (missing relays, full current passing through switchs etc,). As such I want to make sure whatever diode I get can do the job, and be able to take some decent current. I am thinking a 1n4001 may be enough, but am not positive.

If you have a different suggestion on how to wire I am interested in hearing it.

Thanks
Dave

no need for a diode.....(u'd have to have a MASSIVE one.)

Wire the ac circut on a Relay. That will do away with your feed back issue.

PM me if you need a wire diagram.....and I'll draw one up.

Thanks to Holder I got its fixed.

For other people looking for a solution to this, I needed to wire a new relay into the circuit. The AC clutch wire would be the switch signal for this new relay, so when the AC is turned on, the clutch is engaged and current flows to the new relay, which in turn allows current to flow to the fans, and prevents feeback from the fan switch activating the compressor clutch.

Dave

Glad you were able to make out my diagram.....I'll attatch it to this thread for anyone else who might need it.

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