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Any advice diagnosing power windows

Discussion in '6.9L IH & 7.3L IDI Diesels' started by SevenThree91F250, Apr 10, 2021.

  1. SevenThree91F250

    SevenThree91F250 Registered User

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    My driver side power window switches work intermittently but the passenger door switch still works to roll that one down. The driver side lock button works too just not the windows. I am no electrician and not sure how to fix it. I tried following the wires that go through the door into the cab and up by the fuse box but I can't see behind the dash bezel. Do I just remove the dash bezel and check for loose wires? Should I cut out a hole into the dash bezel and patch it with gorilla tape? I dont even know if those wires go into a fuse box or a relay or how the wires even work. Please help where can I begin to learn how to do this electric stuff. Anyone have a wire diagram? Thank you
     
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  2. Clb

    Clb Another old truck Supporting Member

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    Pull the door card, get to the switch, obtain fault information, repair!
    Mine was a loose mounting on the pass side....
    Remember
    These obs trucks, were manufactured following the mantra
    Fast cheap and easy!
     
  3. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    I'm no electrician either but I'll give this a shot. I'd look at replacing the power window switches on the driver's side. I believe that they wear out faster since they generally get used more than the passenger's side does.
     
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  4. Selahdoor

    Selahdoor How can I help you, or make you laugh, today? Supporting Member

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    I agree with @IDIBRONCO

    Look for switches from "Switch Doctor", on amazon. They worked for me.


     
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  5. SevenThree91F250

    SevenThree91F250 Registered User

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    Thing is I was banging around near the fuse box and wiring after the windows stopped working and it ended up being functional again. So I am concerned maybe the connections on the back of the fuse box are bad. I think I might have to rebuild the fuse box. The only thing is it is hard to pull out the fuse box without taking the dash apart although I could be wrong I am new to all this maintenance stuff. Do you guys think I should just rip off the dash bezel and keep it off until I can fix these issues? I see a lot of people just taking the whole dash and steering wheel apart but I want to keep it functional. ALso I was playing around with the fuses and my vents started working again but then I pulled out one of the 10 amp fuses and it shut off
     
  6. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    I may be wrong here, but I think that on your 91, the vent controls were still activated by vacuum. If they are, then the fuses have nothing to do with them working or not. From my limited experience with Bull Nose trucks only, the passenger's side window switches get their power through the driver's side. If the driver's side switch isn't installed, the passenger's side won't get any power. If yours works this way, then there isn't a fuse or power wire that can make the passenger's side work while the driver's side doesn't.
     
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  7. RSchanz

    RSchanz Full Access Member

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    I thought the old saying was pick two? LOL They got away with all 3

    I would guess a simple continuity test would determine this quickly. Do you have a multimeter?
     
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  8. Clb

    Clb Another old truck Supporting Member

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    "Fast, Cheap, and GOOD"
    Production work = fast, cheap, and easy....
     
  9. RSchanz

    RSchanz Full Access Member

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    Guess I read this too early in the morning...
     
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  10. catbird7

    catbird7 Full Access Member

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    I'm the last person you want offering electrical advice, however I know some power window motors have a thermal overload. If you cycle the window up or down and it stops, then a short period later (30 sec) it works again, I'm betting you need a new power window motor.
     
  11. Clb

    Clb Another old truck Supporting Member

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    Or better grounds.
    Diagnosis 101
    Hit the ground circuits FIRST!
    Those thermal limit switches read flow and temp.
    Guess what a bad ground does...
     

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