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Thread: Red wire and white wire on ALDL???

  1. #1
    Fuel Injected!
    Join Date
    Dec 2012
    Age
    41
    Posts
    30

    Red wire and white wire on ALDL???

    I had to clip some wires to get this harness out last summer and now dont remember what these two go to.
    Would be G, and H on the ALDL. Red and white respectively.

    What are they?

    My best guess is G is keyed 12v, and H is a tach signal. Not sure if that is correct though.

    Thanks,

    Jim
    1978 Cherokee chief
    Current status = BACK under construction
    modified body w/TJ flares
    AMC 360, junkyard 7427 TBI w/ 4L80e
    NWF doubler w/
    upside down 203
    SOA D60/14B-FF
    custom shackle flip w/F150 springs
    H1 wheels + (for now) tires


  2. #2
    Fuel Injected!
    Join Date
    Dec 2012
    Age
    41
    Posts
    30
    If anybody has a pinout chart for the ALDL I wouldnt mind seeing that also. I know which is ground and ......................

    Never mind just found it in a shop manual.

    Jim
    1978 Cherokee chief
    Current status = BACK under construction
    modified body w/TJ flares
    AMC 360, junkyard 7427 TBI w/ 4L80e
    NWF doubler w/
    upside down 203
    SOA D60/14B-FF
    custom shackle flip w/F150 springs
    H1 wheels + (for now) tires


  3. #3
    EFI GearHead ! EagleMark's Avatar
    Join Date
    Feb 2011
    Location
    North Idaho
    Age
    59
    Posts
    10,477
    GM 12 Pin ALDL
    A - Ground
    B - ALDL Test Terminal
    C - Air Injection
    E - Serial Data 160 baud
    F - TCC
    G - Fuel Pump
    H - Brake Sense Speed Input
    M - Serial Data 8192 baud

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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