Electric Fan Conversion

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Jan 3, 2010 | 09:05 PM

#16

frederic

Post Fiend

Joined: Oct 2003

Posts: 6,214

Likes: 13

From: New Jersey

Quote:

Originally Posted by ArdWrknTrk

I meant to say to watch the capacity of any fuses or circuit breakers you may have, also the contact rating of your relay.

Fair enough

Quote:

Originally Posted by Scndsin

And why a second diode for the temp switch? Where would the current back up to?

Lame ASCII Art:

temp switch ----->|---- relay coul
AC Compressor -->|----/

Diodes block current in one diretion but not in the other. Wiring in this fashion allows the temp switch to turn on the relay, and the AC compressor to turn on the relay, but prevents the temp switch from turning on the AC compressor.

You could also do this with SPDT relays instead of SPST (normal automotive relays) relays.