No voltage to main blower motor. Motor new & OK, fuse OK, 13.4 volts at fuse. on 1995 Ford E-150

Wiring being the least likely, that leaves the 4 speed switch, blower resistor, and is there also a relay??? Where are the resistor/relay?

by in Aurora, CO on May 07, 2014
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1 answer 6 comments
ANSWER by , May 07, 2014
Did you check the ground, how is it.
COMMENT by , May 07, 2014
When I run a single hot jumper to fan hot lead it runs full speed.
COMMENT by , May 07, 2014
So your wiring is not hot to the blower. The resistor is a ground, the relay is in the left side of the engine compartment and goes through the orange/red wire straight to the blower motor.
COMMENT by , May 07, 2014
So if the resistor is a ground, and I ran a hot lead to the motor and it ran, then the resistor is not the problem. I believe that I should next check the voltage in and out of the relay???
COMMENT by , May 07, 2014
That sounds like a plan to me. The control unit puts b+ With the key on, to one leg of the relay should be a good ground to another. The blower fuse goes to another then when the relay trips it sends b+ to the blower. Go to bed shortly.
COMMENT by , May 07, 2014
Thanks much!!! I'll give it a whirl in the AM.
COMMENT by , May 07, 2014
10-4. Good luck.