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Discussion Starter #1
Hey all... I am installing a switch to my radiator fan, and I was wondering...

Does the fuse have to be more amps than the switch? (30amp fuse, 15amp switch)

or

Does the switch have to be more amps than the fuse? (10amp fuse, 15 amp switch)

Thanks in advance!
~Doug
 

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First of all, you need to find the load (amps) that the fan will draw. try looking at the fuse for the fan in the fuse box or wherever the hide it. Make sure it's not the fuse for the heater fan. The circuit components (switch, wires, fuse ect.) must be able to handle the load. The fuse is always the weak link in the circuit. With a motor circuit I would use a fuse rated about 50% over the motor load, (I.E. if the motor takes 10 amps use a 15 amp fuse), this will cover for starting load. The origional fuse would be a good start to find the motor current draw with start-up protection. start with that size. Be careful what switches you use, most are rated for ac current (like your house has) your car is dc and the switches are rated differently, spend the extra for a good switch.
 
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