If you supply a ground directly from the battery to the fan motor ground, it will make a huge difference in output. I ran one of these ground wires permanently but some like to use a relay on the ground wire.

The second part is to use a relay to connect a 12v power wire from the battery to the fan motors positive power connection.

You can use your imagination and control the relays a number of different ways. You can have 1 toggle switch, or 2. You could control it with the factory fan switch also.

The main thing to get the high speed, is to connect the fan power and ground to the battery. It will blow 2 times harder than the high setting on the stock circuit.

Those were my findings anyways. I have been told by some wiser long term members that it don't help or shouldn't help, but when I flip my "Turbo Fan Switch" my 39 degree ac come blasting through my vents, and it seems to work for me!

We have been having 108 - 112 degree temps and with my window tint and ac, my super cab stays comfortable.

 

Does anyone know if a blower motor and fan from a 92 up truck will fit my 84? My buddys 94 crew cab blows twice as hard as mine on high.

 

I use mine constantly, better mpg's with the windows closed and the a/c blowin.

 

Old thread but I'm having an issue with my blower motor.

I"m getting voltage to the motor but it wont turn on. I'm assuming I have a bad ground but I don't know where the ground is located

Does anyone know or better yet have a picture of the ground for the blower motor?

1990 F350 if it matters

 

Turns out the fuse was melted and i didn't have enough supply voltage

 

My fuse melted too, it was because the motor was drawing too many amps. Replaced it with a new motor and it has higher flow.

 

Yes I'm assuming thats what happened to mine as well, did a little repair to the fuxe box, new fuse, new motor, good to go as far as blower operation.

 

Now that's a good question!

 

Does anyone know if a blower motor and fan from a 92 up truck will fit my 84? My buddys 94 crew cab blows twice as hard as mine on high.
No, that's not the question.
The question is "How much work and duct-tape will it take?"

 

I know this is an old post, but if you have a ground wire direct from the blower motor to the battery will this bypass the blower motor resistor and i will loose control of the fan speed?

 

Not the ground, no.

 

The blower ground is switched, with a different resistor for each speed. Add a relay, clean up resistor/switch/ground connections, add cab/dash grounds as needed.

See my post on improving blower speed and adding a relay, here: https://www.ford-trucks.com/forums/1...tor-relay.html