relay for auxiliary fan

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Jan 5, 2013 | 11:30 AM

mitsuvette

Thread Starter

Heel & Toe

Joined: Dec 2006

Posts: 17

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relay for auxiliary fan

Hi all I have a 1981 vette that I am converting to msd efi. What I want to control with this is the auxiliary fan and at what temp it turns on. It states to wire the msd to the negative side of the relay for the fan. I am having no luck finding this relay and I am sure it exists because the fuse is 30 amps and I would think it needs a relay. Any ideas?

Jan 5, 2013 | 01:28 PM

oldalaskaman

Le Mans Master

Joined: Aug 2010

Posts: 9,272

Likes: 17

buy the relay, it will be new that way

Jan 5, 2013 | 08:29 PM

mitsuvette

Thread Starter

Heel & Toe

Joined: Dec 2006

Posts: 17

Likes: 0

Quote:

Originally Posted by oldalaskaman

buy the relay, it will be new that way

Thanks, I agree that is the best way to go.

Jan 6, 2013 | 02:43 PM

Street Rat

Le Mans Master

Joined: Aug 2010

Posts: 5,339

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From: Central Texas

There is no relay for the aux fan on the 1981. A temperature sensor supplies ground to the circuit to turn the fan on and off.

Jan 6, 2013 | 03:52 PM

alswagg

Burning Brakes

Joined: Jun 2009

Posts: 840

Likes: 4

From: Syracuse IN

Quote:

Originally Posted by Street Rat

There is no relay for the aux fan on the 1981. A temperature sensor supplies ground to the circuit to turn the fan on and off.

Correct, the sensor switches on and off the ground. The B+ is supplied by a dedicated fuse.

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