Blower motor has no voltage going to it

[loquito]

On a thread I read it stated
verify 12 volts to the blower motor as a starting place. It stated if there is 12 volts to the blower motor then everything else is on the ground side.
I am unsure about this information.

what I know is that there is not 12 volts going to the blower motor. I have a good ground going to the blower motor that comes on with the switch.

I read a post from 2016 where @Jerry Bransford attempted to help someone with their 2000 wrangler he even posted a wiring diagram, but that thread suddenly stopped after Mr Bransford asked a question that went unanswered.

On my 2000 wranger fuse 8 behind the glove box & fuse 1 in the PDC in front of the battery all are good. I am currently lost on what steps to take next.

 

[Rubicon John]

Check the blower motor resistor for voltage. If it has power and ground it’s probably bad and not supplying the motor with voltage.

 

[Chris]

Same thing happened to me on my 4.0 XJ. I went mad for a month trying to trace it down.

Come to find out it was a wire going into the fuse block junction. It had power going into it (coming from the battery), but no power going out the other end.

In other words, it was a bad connection at the fuse block junction!

 

[TrueTexas]

The 12V+ is the simple side of the blower motor wiring. Essentially, when the vehicle has accessory power, it energizes a relay behind the glove box and the relay connects the battery to the blower motor. If you dont have 12v+ to the blower motor itself when the vehicle is in the run position, then it is most likely
1. The 40 amp underhood fuse
2. The fuse behind the glove box for the blower motor relay
3. The relay itself.

The relay you are looking for is behind the glove box - to the bottom right next to the green plug.

If all of these check out and you still dont have 12V+ to the fan when the vehicle is in the run position, you need to start tracking wires down.

FYI - The blower motor resistor is part of the ground side of the blower motor circuit and is essentially bypassed at the highest fan speed. So if you have no fan at any speed, chances are it is not your blower motor resistor.

 

[CharlesHS]

IF fuses 1 & 8 are good and there is still no voltage thru the fuses; then check the source coming from the ignition switch.