Wiring electric fan.

[Popp55]

So I just need help on how to wire in my electric fan. I put a new motor in a few months back and now when I give the truck gas my fan flexs too much and starts to hit. I've already put a spacer on it and it didn't help. So I decided an electric fan would be my next option. This truck was a project from my grandfather for the both of us until he passed away. So I've been going at it with basic knowledge but wiring is not my strong suit. I'm just curious on where I can connect it as far as the fuse box and if I should run it to constant power with an on/off switch or just power to the ignition if that makes sense.. truck is a 1972 C10.. thanks!

[leddzepp]

Hey neighbor I’m in Riverside also! Thinking about using an electric fan on my 68 so curious to see how others have done it as well.

[VetteVet]

Here is a simple diagram that should help.




1.The wire from the battery goes to a 30 amp fuse, then to no. 30 on the relay.
2.The wire from the fan which goes to the relay is connected to no 87 on the relay.
3.The wire from the manifold sensor is a ground wire controlled by the coolant temperature is grounded and it is connected to no. 85 on the relay.
4.The wire from the ignition switch "on power" goes to no.86 on the relay.
5.There is a number 87A terminal on most of these relays but it isn't used in this app.

The manual override switch is just a ground to the number 85 terminal to override the sensor control you need in the manifold.

These kits usually come with a fan kit as a total package. The override switch
may not be included but it is simple to install.

[Andy4639]

Install it on a relay and have it come on by temp probe you stick in the fins of your radiator. You could also put a manual switch in line to over ride the probe if you need it.

[cleszkie]

I am all for electric fans (I run twin 2300 cfm Derale units). However, have you considered replacing your belt driven flex fan with a stock steel rigid fan? This will eliminate the fan interference with the shroud at high RPM. Seems like a much easier fix to your problem (I am assuming that cooling is not the issue). If it ain't broke, don't fix it

[nikwho]

I am running this controller, with the temp switch installed in the water pump. It's powered with a constant 12v source, so after the truck shuts down, the fan continues to run until the coolant is below 180°.

http://derale.com/products/electric-...t-11-32-detail

[davepl]

If this is a reasonably stock truck why not put on a good 7-blade fan with a clutch? That's what my big block has, works for me!

[Stocker]

Originally Posted by davepl

If this is a reasonably stock truck why not put on a good 7-blade fan with a clutch? That's what my big block has, works for me!

I agree. Also, pics should help determine why your fan is flexing to the point of hitting something. That's not a common problem.