Wiring An Electric Fan

[b110sss]

Just finished front mounting a new 10" Davis Craig electric fan.
The kit came with a relay- is this necessary given that I am just wiring in a basic on/ off switch?
Also where would be the best place to grab a + wire to go through to the switch?
Cheers
Dave

[datsunboy]

Standard switches aren't designed to run the switching current of fans or headlights etc hence the need for relays.
You've got the relay so wire it in.

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[85_Z31]

I trigger my fans from the Ignition on circuit , i borrowed a a signal wire from the ignition coil to get a +12v signal for the relay.

[Bartman]

I would recommend fitting a thermo switch to your radiator. Fit a relay, run 12v + to the trigger side from the coil, and run the - side of the relay trigger off the thermo switch.

[b110sss]

Thanks Guys.
Bart, I will in due course fit a thermo switch but in the meantime bearing in mind that we are talking about a race car I want to just run an on/off switch so I can manually control the fan.
With a switch in the dashboard where would be the easiest place to tap into to get a power feed- ignition switch?
Cheers
Dave

[2 doors]

Use the relay and take the trigger from the stereo,

[gman]

Use the relay and take the trigger from the stereo,

Ha that's what my race cars are missing a stereo.