That's the one. What a cluster. When you figure this out you will be the go to guy for that problem, for sure.

 

Not likely to fix your issue.

Part you want to buy is there to reduce blower speed. When disconnected and out of system your blower should run full tilt unless other issues prevent.

Blower your bucks but expect no increased breeze.
........

 

number 9 number 9

before i cut up the system and before the fan totallly failed it worked only on high. if its not the connectors or fuse then maybe its that rusted out transistor.

think i'll hardwire until i get to the root of it.

 

Then I may have put the OP on a bad path just trying to be helpful.

I understood that the transistor compounded amperage, not regulated voltage. When I metered my blower the voltage did change between 3.7 and 9.7. But I don't know how to test amperage. Sorry, OP. I was just lucky when I put my Pontiac blower in.

 

All good Charlie. We're messing around in the dark here a little.

Voltage looks good. Battery to engine fuse box. Still looks good engine fuse box to drivers side fuse box. Looks good thru bypass hack and on to fan. Doesn't work. Must be that amp thing so I guess I'm checking the engine fuse box connections or doing that bypass to the drivers side fuse box? arghhhhh. If I was Xhibit I'd get all new stuff..or a great sound system.

So then I decided that I should get the blower working at least temporarily (to get some air and figure out the rest of the HVAC system) so I ran a pair of wires from the battery to the drivers area and jumped it to the fan. It blows, makes a turbo noise but it's not impressive.

But worse, it goes on as soon as I connect it, even when the engine is off. So I need to tap power somewhere, maybe after the fusebox?

I'm wiring the connection from the battery so that I could use it in the future for something. Maybe a winch? I went thru the firewall and tucked it neatly.

Pics to follow.

 

The numbers signify 1) connector removal and splice, I ran the fan ground temporarily to this black wire 2) hot cable coming from battery (w/ fuse) connecting to fan and 3) ground of fan. There should be a 4 there to show original fan power and ground slightly below and to the left of the 3.

I wired the hot and ground from in front of the fusebox around the engine to the drivers side and thru the wiring hole in the firewall. Came out behind the pedals. Easy. I ran it to the drivers right side for testing. Wired the fan ground to another ground in that wire cluster and it works. Makes a lot of good fan noise but I'm not impressed on power. It'll do for now.

So power is hot all the time...I need to find another hook up spot after the fusebox? or use an on off switch I guess.

I'd like to put the power to an existing switch or new one on the surround. When I get my AC system sorted I can use the power for something else. This truck wont get winch or lighting accessories...nor a fridge, tho.

As for getting the electrics sorted, I think it must be an amperage issue. I can track the 13v from the engine to the original fan power but it wont operate the fan. I need to address this as it probably affects wipers as well. There's also the chance I messed up the wiring but I'm hoping I didn't.

 

Great pictures and explanation. I hope this gets sorted. Those pictures will help others.

 

You should jump on this.

 

i did. I can use just about anything on this one.