i have an electric fan off of a volvo on my car, and it worked great till it melted my switch. i have an inline fuse in it too. If i run it through a relay it should work without frying anthing or blowing fuses right? thanks,
yes it should. a relay is like a high current switch and is the only way to wire any high powered accessory, IMHO. i would use a min of a 75 amp relay.
A 75 amp relay is a bit of an over kill. If you go to a stereo/alarm shop and find a good made in the USA or Germany 40-50 amp relay, you'd be set. You can also use a 40-50 amp switch. use a 30-35 amp fuse and good quality 12 (or 10 if you run the relay inside of the car) guage wire. This setup is a bit of an over kill, but very safe.
A 75 amp relay is a bit of an over kill. If you go to a stereo/alarm shop and find a good made in the USA or Germany 40-50 amp relay, you'd be set. You can also use a 40-50 amp switch. use a 30-35 amp fuse and good quality 12 (or 10 if you run the relay inside of the car) guage wire. This setup is a bit of an over kill, but very safe.
So you are saying a 75 amp relay is overkill (not knowing what kind of fan he runs or what it draws), but then you go on to post info about wire gauges which you say are overkill? I would not want to run an unknown-draw fan through too small a relay. If the relay is too big, no biggie. start up spikes can kill off relays.
If using a relay, why would you tell him to use 10 or 12 AWG wire for the control side of the relay (and a 40-50 amp switch)?
I think I will stick with my 75 amp Bosch relay and 18 gauge wire on the control side of the relay.