Taurus fan and windstar fan

It may be possible that simply your battery is pushing more amperage than the battery in the windstar, you can try a bigger gauge wire to prevent it from getting hot. Or put an inline fuse in the wiring so just in case something goes wrong the fuse will just blow.

relays are just a switch they do not control the amount of current. Current draw is determined by the motor and the voltage applied to it. If you hooked the fan up to several different batteries, as long as the are 12v, the fan motor will draw the same amount of current, provided they are charged. A stronger battery will not "push" more current through the fan motor, the fan will just run for a longer period of time.

If it is getting really hot it could be that the insulation on the high speed windings of the motor is starting to break down, this results in a drop in resistance which will increase the current draw of the fan. If I were to run it I would put a fuse on it. Find out what the amperage of the fan at high speed is and then get a fuse that is larger than that. I.E. if the fan amperage was 20 amps I would get a 30 amp fuse and the appropriate size wire. If you go too large the fuse will not do its job if you go too small you can have nuisance problems with burning up fuses.

lincoln+ford said:

Alright sounds good, im guessinga good multi meter will be able to tell me amperage?

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It'll be an expensive one that can handle the amperage of a fan. A current shunt can be used with a meter that cannot handle the load internally.