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Slow and labored power windows

Discussion in 'Electrical & Audio' started by FireTruck1984, Dec 1, 2019.

  1. FireTruck1984

    FireTruck1984 Full Access Member

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    Location:
    Michigan
    First Name:
    Ted
    Truck Year:
    1984 1984
    Truck Model:
    High Sierra K10 350. Sierra Classic C10 305.
    Engine Size:
    350
    Thanks for the great info !
     
  2. FireTruck1984

    FireTruck1984 Full Access Member

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    Location:
    Michigan
    First Name:
    Ted
    Truck Year:
    1984 1984
    Truck Model:
    High Sierra K10 350. Sierra Classic C10 305.
    Engine Size:
    350
    This is very helpful ! Thanks
     
  3. FireTruck1984

    FireTruck1984 Full Access Member

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    Joined:
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    Location:
    Michigan
    First Name:
    Ted
    Truck Year:
    1984 1984
    Truck Model:
    High Sierra K10 350. Sierra Classic C10 305.
    Engine Size:
    350
    Thanks, I’ll check those areas
     
  4. FireTruck1984

    FireTruck1984 Full Access Member

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    Location:
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    First Name:
    Ted
    Truck Year:
    1984 1984
    Truck Model:
    High Sierra K10 350. Sierra Classic C10 305.
    Engine Size:
    350
    OK, I’m a novice with electrical components but I’ll try to figure it out
     
  5. FireTruck1984

    FireTruck1984 Full Access Member

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    Joined:
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    Michigan
    First Name:
    Ted
    Truck Year:
    1984 1984
    Truck Model:
    High Sierra K10 350. Sierra Classic C10 305.
    Engine Size:
    350
    A lot of suggestions for this fix, I will try it . Thank you !
     
  6. Doppleganger

    Doppleganger Supporting Member Supporting Member

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    Location:
    OH-MI.....just like it sounds
    First Name:
    Chris
    Truck Year:
    1985
    Truck Model:
    K20
    Engine Size:
    5.7
    You can run the relay straight to the battery but it still wont work until the key is on. Common upgrade for headlamps that way too.

    I pulled the power window sub-harness from a Benz sedan - complete with Bosch relays to use for mine. Just have to solder the corresponding switch wires to the harness. IIRC cost me a whopping $10. lol
     
  7. Snoots

    Snoots Supporting Member Supporting Member

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    Location:
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    First Name:
    Roger
    Truck Year:
    1973
    Truck Model:
    Jimmy Sierra
    Engine Size:
    350
    1977 I believe. When power windows became available.
     
  8. FireTruck1984

    FireTruck1984 Full Access Member

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    First Name:
    Ted
    Truck Year:
    1984 1984
    Truck Model:
    High Sierra K10 350. Sierra Classic C10 305.
    Engine Size:
    350
    Great idea! Thanks
     
  9. Chaz

    Chaz Full Access Member

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    Location:
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    First Name:
    Charles
    Truck Year:
    1989
    Truck Model:
    V2500 Suburban
    Engine Size:
    350 tbi/th400/np241c
    I just recently did the lmc truck relay upgrade on my suburban. Ended up replacing drivers side door switch....4 switches in one assembly. And the pigtail... Still had problems until i realized the connectors that go to the motor were bad....replaced 2 connectors at front two motors....and now my windows work great.....lots of power and they are faster than my wifes 2003 suburban windows....if your motors are original than u might want to replace them i had two motors on the rear door....one outta parts truck door.....and they were super slow....replaced the motor with new lmc truck motor....60 bucks....and works great now.....
     
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  10. Chaz

    Chaz Full Access Member

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    First Name:
    Charles
    Truck Year:
    1989
    Truck Model:
    V2500 Suburban
    Engine Size:
    350 tbi/th400/np241c
    I like the lmc relay kit because its super easy install with good directions.....i dont think i could build the relay kit myself.....i hate doin electrical......its a 40 dollar kit for 2 doors....comes with everything pre made.....i didnt even solder any wires just used the crimper and butt connectors and elec tape.....just didnt have time to solder all those wires......works great now....
     
  11. FireTruck1984

    FireTruck1984 Full Access Member

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    Joined:
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    Location:
    Michigan
    First Name:
    Ted
    Truck Year:
    1984 1984
    Truck Model:
    High Sierra K10 350. Sierra Classic C10 305.
    Engine Size:
    350
    I replaced the motors and regulators.. it seems like a power issue
     
  12. C10MixMaster

    C10MixMaster Full Access Member

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    Joined:
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    Location:
    Kingman AZ
    First Name:
    Ben
    Truck Year:
    1977
    Truck Model:
    C10 BIG10
    Engine Size:
    ZZ4 350
    This shows for 73-87 which is not accurate. 73-76 no power windows 77-81 grounded through the motors and used a different motor switches and wiring. The relay upgrade shown should work for 82 and up.


    The windows in my 77 are slow as molasses I usually only use them with the engine running.
     
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  13. gmachinz

    gmachinz Harnessworx Inc

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    Location:
    Iowa
    First Name:
    Jabin
    Truck Year:
    1986
    Truck Model:
    K10
    Engine Size:
    350
    That diagram posted up was from a Corvette forum many years ago and its misleading at best trying to apply that to 77-81 trucks and is 100% NOT accurate for 1982-up trucks.
     

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