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Wiper switch 1977 Blazer

Discussion in 'Electrical & Audio' started by 1977 Blazer, Jan 24, 2021.

  1. 1977 Blazer

    1977 Blazer Junior Member

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    Joined:
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    Location:
    San Antonio
    First Name:
    Isaac
    Truck Year:
    1977
    Truck Model:
    Blazer
    Engine Size:
    350
    I bought the Blazer and there is no harness at all for the wiper switch under the dash. I need help identifying which wire goes where from the wiper motor to the switch. The motor has a black/white and grey wire coming from the top and white, grey and dark blue coming from the bottom. I’m not an electrician, please respond with which colors go where. Thanks, in advance.

    7957DE08-F4F8-4961-B940-6C6F9C988747.jpeg

    D4359713-5C7C-4775-BB0D-F041A02B8DE7.jpeg
     
  2. 78C10BigTen

    78C10BigTen Full Access Member

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    First Name:
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    Truck Year:
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    Truck Model:
    C10 BIG TEN
    Engine Size:
    350
    To me that appears to be the wrong wiper motor... 77 should have the washer pump attatched to the upper left of the motor.
     
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  3. 1977 Blazer

    1977 Blazer Junior Member

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    Truck Year:
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    Truck Model:
    Blazer
    Engine Size:
    350
    Okay. The truck has gone through several modifications before I got it. The engine is a late 80’s 359 with a throttle body and who knows what all they did to the electrical system. Do you happen to know which wire goes where? The wires coming from the top have been cut and spliced at least twice. I need to get them running so I can pass inspection.
     
  4. 78C10BigTen

    78C10BigTen Full Access Member

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    Engine Size:
    350
    I honestly dont without looking at mine but im not near my truck.
     
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  5. bucket

    bucket Super Moderator Staff Member

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    Truck Year:
    '77, '78, '79, '84, '88
    Truck Model:
    K5 thru K30
    Engine Size:
    350-454
    Going off my memory, that switch you have pictured is '75-'77. It is not compatible with the '85+ wiper motor that is installed. Has a later steering column with a multi-function stalk been swapped in?
     
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  6. 1977 Blazer

    1977 Blazer Junior Member

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    Truck Year:
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    Truck Model:
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    Engine Size:
    350
    There is a newer column, presumably from the same truck that donated the engine and computer. And that was it, I didn’t even try the column mounted switch because the steering column was butchered when they swapped it and figured none of that stuff worked. So, I’m an idiot.
     
  7. bucket

    bucket Super Moderator Staff Member

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    Engine Size:
    350-454
    So it works from the column?

    If so... hooray!!! Easy fix!!! Lol
     
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  8. 1977 Blazer

    1977 Blazer Junior Member

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    Truck Year:
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    Truck Model:
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    Engine Size:
    350
    Yeah, they came right on
     
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