Quote:
Originally Posted by A930Rocket
A follow up to my thread on a non-operational radiator fan in the E46.
If I want to put a switch in the car to operate a relay for the fan, what size wire and relay would I use?
The fan currently has a 50 amp fuse, so a 50 amp relay? Would it be better to go with a higher amp relay? Is there such thing as too much?
Using and SPST switch, is it better to use the switch with the positive or ground wire?
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Question, Isn't the switch going to power the relay coil? I think that's how I'd wire it.
The fuse protects the wire. So if you've got a 50a fuse, that's typically sized for the amperage required for the fan when the fan first starts (LRA if I recall correctly) If you put an ammeter on the wire when it's running, it's probably not pulling anywhere close to 50 amps. That's a lot of juice!