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Thread: Buick Century Gran Sport 455 wiring diagram

  1. #1
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    Buick Century Gran Sport 455 wiring diagram

    Hi everyone,

    I need wiring diagrams for my 1974 Century GS 455, Please anybody can help me with this?

  2. #2
    the third generation of the Century nameplate ran from 1972-77 and actually takes over from the Skylark name on the mid size A-body cars. Skylark would return in 1975, but on the compact X-body Nova type cars.

    while we don't have your specific year, we do have 1975 which should be very close.

    https://www.teambuick.com/reference/...ssis/index.php
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  3. #3
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    Here is the overall diagram for the whole electrical system out of the '74 shop manual. The index page shows more detailed views that are also available in case you need them.
    Attached Images Attached Images
    What has been, can be again. (Bob Wills, 1942)

  4. #4
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    It doesn't get any better than this,

    https://www.ebay.com/itm/1974-Buick-...dYGMIj&vxp=mtr

    That is a screaming deal with free shipping.
    Larry

    1970 GS455 Stage1 Race weight 4025 lbs.
    TSP 470, 602 HP, 589 TQ
    MT headers, Gear Vendors Overdrive
    Best E.T. 11.54 Best MPH, 116.06
    1998 Riviera SC3800

  5. #5
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    Quote Originally Posted by bob k. mando View Post
    the third generation of the Century nameplate ran from 1972-77 and actually takes over from the Skylark name on the mid size A-body cars. Skylark would return in 1975, but on the compact X-body Nova type cars.

    while we don't have your specific year, we do have 1975 which should be very close.

    https://www.teambuick.com/reference/...ssis/index.php
    Thanks, It is very helpful.

  6. #6
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    Quote Originally Posted by TODD View Post
    Here is the overall diagram for the whole electrical system out of the '74 shop manual. The index page shows more detailed views that are also available in case you need them.

    Thanks for your diagrams, Those are what I want, If it is possible can you please send them with better quality (resolution)?

  7. #7
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    Try these done on a flatbed scanner at 300dpi instead of a cell phone camera.
    Attached Files Attached Files
    What has been, can be again. (Bob Wills, 1942)

  8. #8
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    Quote Originally Posted by TODD View Post
    Try these done on a flatbed scanner at 300dpi instead of a cell phone camera.
    Thanks Todd, These files are really good and helpful.

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