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Thread: T-87 Bench Harness

  1. #1
    Lifetime Member Chavez91's Avatar
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    Default T-87 Bench Harness

    Do you Ross or anyone happen to have the Bench Harness pinouts for the T-87

    The only document I could find shows

    Pins 37/53 - GMLAN +

    Pins 38/54 - GMLAN -

    Pin 35 - Key ON power

    Pin 65 - Ground

    Pin 66 - Battery +

    Am I missing any or are any of the pins wrong?
    Last edited by Chavez91; April 17th, 2016 at 07:04 PM.
    Josh

    '04 GMC LLY
    - L5P, Motech, 6-Spd Conv. ML Trans.
    '05 GMC LLY - 250%, 12mm, 67mm Custom Turbo, 6-Spd Conv. ML Trans
    '19 3500 RAM - Tuned Aisin 0_o

  2. #2
    Forum tyhee Site Admin GMPX's Avatar
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    Quote Originally Posted by Chavez91 View Post
    Do you Ross or anyone happen to have the Bench Harness pinouts for the T-87

    The only document I could find shows

    Pins 38 - GMLAN -

    Pins 37 - GMLAN +


    Pin 35 - Key ON power

    Pin 65 - Ground

    Pin 66 - Battery +

    Am I missing any or are any of the pins wrong?
    Powers are ok, CAN PIN's as corrected in red above, but it needs a CAN terminator or ECM on the bus at the same time.


  3. #3
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    You will likely also need 12V ignition power (key ON power) to pin 51.

    EDIT: Sorry - that is for an 8L90 (T87) - not sure if the Allison is the same

  4. #4
    Forum tyhee Site Admin GMPX's Avatar
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    You don't need 51, that pin out above worked for me. The T87 hardware is the same between the 8 speed and the Allison, the software is different.


  5. #5
    Lifetime Member Chavez91's Avatar
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    Using 35, 37, 38, 65, 66 and then terminating across 53 & 54 (i used an LLY ECM as I was too lazy to dig for a resistor) has gotten the job done perfectly.

    Thanks!

    Sent from my Nexus 6 using Tapatalk
    Josh

    '04 GMC LLY
    - L5P, Motech, 6-Spd Conv. ML Trans.
    '05 GMC LLY - 250%, 12mm, 67mm Custom Turbo, 6-Spd Conv. ML Trans
    '19 3500 RAM - Tuned Aisin 0_o

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