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
wire yourself a toggle switch between the battery and fan and run into passenger compartment
I assume you are wanting to manually control the fan. Just run a positive wire from the battery to the toggle switch line side. Then run another wire from the toggle switch load side to the fan. Ground the fan at the fan location. Be sure and use a large enough gage wire to handle the current and an in line fuse to protect the circuit.
disconnect the connector and run a wire from the battery to the fan if it runs it is good
The cooling fan generally does not run when the car is cold, but could be wired directly to the battery so that when the ignition is engaged, the fan comes on. This is not a factory modification but is often accomplished if the car tends to run hot.
Unless it is a 12 volt DC box fan you cannot run it at all. If it is a 12 volt fan the time it will run depends on it's size and at what speed you run it and the condition of the battery. All you can do is try it.
Disconnect the power wire from the fan and run power directly from the battery to the fan. If it's still good it should run.
to shut the fans on and off by yourself. remove the connector for the wires at the fan. hook a wire from the positive on fan motor to the inside toggle switch, do not hook to switch yet. run a wire from the positive on battery, hook to battery after hooking up switch. hook up the wires to the switch. then the battery. its up to you if you want to install a 15 amp fuse in line from battery to toggle switch.. you can also get the power from the fuse box instead of the battery. this should work for you. if not you may need to ground the other fan wire.
Run a wire from the positive terminal on the battery to the fan motor. If the fan will not run when hot wired, the motor is burned out and will have to be replaced. If the fan will run when hot wired, check the fan motor fuse. It us probably in the engine compartment near the battery.
on cooling fans disconnect wire at fans,runwire from fan side to positive on battery!!run another wire to ground. if they are ok they will run!!if not it can be bad fans or a bad fan sensor!!check for bad fuse!!first
A temporary fix would be to run the power for the fan directly to the battery. You would need a toggle switch to make it easier on yourself. Find which cable belonging to your fan is the one that conducts the power, on my car its the black and red one. You'll have cut off some plastic off that wire and then connect a good a wire from that one to the toggle switch, then run a wire from the toggle switch fo the positive post on your battle. The switch is need to be able to turn the fan on and off so you will have to find a way to run the switch into the cabin.
To wire up a car horn with a button you first need to run one of the wires from the horn to the battery. Take 1of the wires from the horn and run it to where you want the button to go. Connect the wire to the button and that's it.
check power to fan, wiring, bad relay, bad fan. you can hot wire fan - take 2 wires w/ alligator clips on each end, connect each one to car battery terminal, then ground the NEG wire alligator clip to metal on car, then the POS alligator clip to terminal on fan, if fan is good it will run. Or take 12 volt test light (easier) buy one real cheap, one connector to each of the fan wires & if it lights up - then fan is bad. Cause fan motor has power directly to it so if not run = bad.