Plain Jane OEM nothing to see here rebuild

[Pete_89T2]

Any DC motor only needs 2 teminals to run - a positive (+) and negitive (-). Reverse those two and the direction the motor spins changes. Based on what you're seeing, once verifed as Gunny suggests, your wiring must be switching polarity somehow.

Do you have a electrical schematic diagram of the Taurus fan motor assembly or can you draw one up from what you've got? Any relays and resistors in there? When it was installed in a Taurus, was the fan motor grounded to the car's body/engine, or was it a floating ground due to it being mounted on rubber isolators/plastic? We'll need this type of info to steer you in the right direction.

[JustJeff]

Originally Posted by GySgtFrank

If the fan is having to be dragged to a stop and reverse directions that would explain blowing a 40A circuit breaker. Check to see if in fact the fan blade is reversing direction from low to high. if so does the spare fan do this too? If it does, there is something going on with the way it's wired. If it doesn't there is something internal to the fan that is truly screwy.

I don't have both high and low speeds setup on individual switches. I have both high and low with spade terminals and I switch them out. Was going to keep it that way temporarily...till I work out my issues. That being said, it wasn't switching from low to high. I manually/physically switch them. It's on high and while driving that on high the circuit breaker trips. I haven't been able to recreate the problem while idling and working on the car. BUT once it starts doing it (while driving) it will continue to do it while idling. I simply have not been able to get it to start doing it while idling.

Originally Posted by Pete_89T2

Any DC motor only needs 2 teminals to run - a positive (+) and negitive (-). Reverse those two and the direction the motor spins changes. Based on what you're seeing, once verifed as Gunny suggests, your wiring must be switching polarity somehow.

Do you have a electrical schematic diagram of the Taurus fan motor assembly or can you draw one up from what you've got? Any relays and resistors in there? When it was installed in a Taurus, was the fan motor grounded to the car's body/engine, or was it a floating ground due to it being mounted on rubber isolators/plastic? We'll need this type of info to steer you in the right direction.

Excellent point on the diagram. I do have one buried in this thread. I gotta head to work (half day on Sat. cause I took time off this week), but I'll post up the diagram once I get to work.

It can only be two things. Either my wiring is wrong ie: did not follow diagram correctly or the fan is faulty. My plan after work is to dig into my wiring.

It's just very odd that on one speed it spins correctly and on the other it doesn't. I'd think it would have to be consistent direction on both.