How do you wire a fan to run on a car battery?

Answer 1

Simple answer is this:

Positive (Red Terminal of the Battery) to the Red wire of the Fan

Negative (Black Terminal of the Battery) to the Black wire of the Fan.

Now more additional Information:

By wiring the fan as described above, you will have the Fan running 100% of the time.

a. You can put a Toggle switch in the vehicle and then you are responsible for turning the fan ON and OFF. If you forget to turn it on, then you will overheat, if you forget to turn it off, you will kill the battery.

b. You can wire it another way..... Instead of taking Power from the Battery, you can buy an attachment (Electrical Connector) and receive your RED POWER from a source that is ONLY ACTIVATED WHEN YOU TURN THE KEY ON. This is a better way of wiring the Fan and you can ground the Fan to the Battery or chassic. This is a BETTER WAY, not the BEST WAY.

The reason your Fan comes on when the fluid gets to certain level is FUEL is Expanded when heated and increases your mileage and if the fan is ALWAYS RUNNING, it takes longer to heat up your car. Many of the repairs to the FAN is done by replacing the FUSE RELAY. This is the BEST WAY to repair the system

Answer 2

Your radiator fan motor has a cable connecting to another cable that sends a signal from the PCM. Unhook those cables. Now look in the cable there should be a ground and a positive wire. Hook two jumper cables to it in that order and than to your battery.