Blower motor not working

The blower motor is not working on any setting. I have the electrical diagrams from the factory service manual. When I check pin 5 on the heater relay I’m not getting power at all. The only time I get power is in pin 2 when I have the truck running. I pulled the 50 amp fuse. It looks good and I checked for continuity between where the bolt screws in and all three tabs coming out of the 50 amp fuse. Im getting continuity on all three tabs. One other thing to note is in the factory service manual page ac82 doesn’t match the way my relay looks however on page 38 of the relay locations it looks more like the 5 pin relay I have. Also I moved some relays and also bought a couple relays but didn’t fix it. I take it that the voltage should be battery voltages at pin 5 with ignition on or off. It is fed from the 50 amp fuse, correct? Is there anything between th 50 amp fuse and pin 5. One more thing I bought a new blower and just tried plugging it in and it doesn’t work either, which I wasn’t expecting it to but I had it on hand so I tried it. Any help would be greatly appreciated. TIA.

 

Some important info needed….year, cab type…AC, RC, DC, eng V6 or V8….etc

Adding that info to your profile would be great also !

edit....
In case it helps, regardless of what year or cab type, there should be 12vdc at pin 5 of Htr relay at all times

 

I thought I had done it. I had put the truck information into the signature line but I guess that doesn’t make it to the posts. I went back in a minute and found the vehicle section. Sorry!
Something else I noticed is I have no high beam on my headlights. Also could someone send me a picture of the pin detail for the heater relay. In the FSM in the testing section it shows different than what I have. I just am want to verify that I am testing pin 5.

 

LED headlight bulbs?

 

No just the standard bulbs.

 

Process of elimination as far as pin 5....with the heater relay pulled, the 2 flat pins that are bigger than the other 3 are pin's 1 and 2 for the relay. If you place meter on resistance with 1 lead to gnd and with other lead, check the 3 smaller pins, the 2 pins that show a short to gnd are pins 3 and 4. That leaves the remaining as pin 5 and should show 12vdc to gnd.

As for is there any thing between "50 amp fuse and pin 5"....pin 5 goes from Eng Rm R/B No. 2 straight to the Fuseable Link Block that's inches away.

 

I’m not getting power to pin 5.

 

I'm not getting power to pin 5. What would you recommend I look into next? I have continuity to the fuse in the cab but I have not checked for power to the fuse.

 

I would suggest revisiting the 50 amp fuse. You said in first post it "looks good", does that mean you checked the fuse with your meter for continuity and the fuse was indeed shorted, meaning fuse is good ?

When you say cab, you're not meaning the Engine Bay correct, which is where the 50 amp fuse is.

With the 50 amp fuse pulled, you should have 12vdc to Gnd on one of the pins of the fuse socket even without key in ignition.

Let's get that far and go from there to make sure we're on same page after all this time.

 

Ok, I think I figured it out. I was looking at the wrong fuse. The fusible link is burnt on the heater fuse. Trying to get one today if not I will have to order it. Now a new problem. I put the fusible link back in and put it all back together now I’m not getting any power at all. When I try to start it no lights come on or nothing. I checked the voltage where it screws onto the fusible link and no power. Should there be power there? Any ideas? This truck has been driving me crazy lately. It has been perfect for 10 years.

 

Did you have battery undone when doing this work ?

I would revisit everything you’ve done to make sure you did not leave something undone, including grounds.
Not knowing where you’re checking for voltage where you say there is none, I can not say one way or the other but from a far my guess is you may have shorted something to then have nothing when turning the key.

Even tho I‘ve never had to mess with fuseable links, I’ve seen enough video to know this request is easier said than done. Take some good pictures of the area you are working in case there is something we might see that your not.

Other than that

 

I had left a connection loose! Hooked it up now it starts. Hopefully the fusible link fixes the ac/heat and then all should be good, hopefully! Thanks for your thoughtful and quick replies!