[Fixxxer22]

Hi there. New to the site. Have belonged to other forum sites for past hobbies.

Hi! Mitch here. Vetted myself as a ford master tech before starting my own shop in Iowa.

My first car was a 1990 Isuzu pickup. I loved it. And of course, i no longer have it. Lately i have been in the alignment to acquire an Isuzu or 2. I found a white 2wd survivor earlier this fall. I just bought another one (gold). The gold one is pretty hacked up. Found someone had direct wired the blower motor to a switch. So, besides dealing with the charge relay nonsense for diag i found the blower motor resistor at fault. But, i cant find any from my vendors. Not even rockin auto. I can find the later model 93-95 but do not know what the difference is. Any help would be appreciated.

Ill post pics of my first ride and what ive got going on with the other 2.

I have the head off the gold one. Getting air checked and decked. I had head gasket failure on my first one (i overheated it) I put likely a fel pro in it and had no issues for years. Reading on here that people are having issues with them? Anyone got a lead on OEM gaskets as well?

Again, New to forum. I appreciate any help i can get. Ill chime in wherever i can. epairing today

 

[Fixxxer22]

This unit will not work on high. Even speed 4 runs through resistor. I load tested the ground to the switch and verified ground of each leg at each position at resistor. I ordered one from CQ for a 1995 pickup. I checked the wiring diagram of it and it all looked the same is the blower case different?

That is a generous offer. I may take you up on it. Ill keep you posted.

 

[Fixxxer22]

Switch load tested to ground with heavy bulb @ resistor. Switch passed component testing. Used a 1995 resistor from CQ. Unit works but speeds are goofy. 1- no operation 2 med 3 high 4 med-low. Im guessing that i can move the pins around the connector to make the 1995 work in the 1992. So, in my case my resistor is open even in the direct continuity circuit.

 

[Fixxxer22]

looking at diagrams of the 1992 and 1995 the pin placement is different from switch position to pin position in resistor. I'll move them in the connector and report back.

 

[Fixxxer22]

Alright kids, I finally had a free minute away from customer work to plink around with the gold pickup.

I did some browsing on this forum and found that the 1992 resistor was possibly available OEM. But, I wanted to continue on with my assumption. So did and i hope it possibly helps someone someday.

I found the 1993-1995 HVAC blower motor resistor was readily available at many aftermarket parts stores (carquest/advance, arnolds, oriley). Its overall appearance looked similar. I examined both wiring diagrams (1992 vs `1995). The circuit was identical just pinned different.

So, if you need a resistor for a 1988-1992 pickup and you want it fast all you have to do is de pin the connector @ the resistor and move the pins around. Swap pins 2 and 4 with each other and move pin 5 to pin 1. Works as it should.

I had to shave a little of the top of the resistor plastic off. It hit a seam in blower case. I think the screw holes are a little lower. You could also just egg the holes out. The screw heads are huge. I pictured both resistors. The original on the right. Pin 1 on original resistor is not used. Pin 5 in newer resistor is not used. The pins are numbered 1-3 top row going left to right and 4-6 left to right bottom row.

I pictured my old resistor from the back. I could have fixed it. Failed solder connection.