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Thread: Reworking My own LS@ 2005 GTO Harness and need some help.

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    Reworking My own LS@ 2005 GTO Harness and need some help.

    Gentlemen, I am a hobbyist and have just retired. I am trying to rework my LS2 harness and have come up with 5 or 6 questions. All of these questions are in regards to C1 on the E40 ECM.
    1.) C1-10 Engine Control Relay - should I use it or just supply Power to Ign 1 via fuse
    2.) C1-13 Starter Relay output coil. Where to connect?
    3.) C1-18 Accessory Voltage - Is this power to ECM or to power Accessories
    4.) C1-32 Stop Lamp Switch - To ground when brake is depressed via switch?
    5.) C1-38 To Use or not to use is the question?
    6.) C1-51 Im assuming this is not needed for T56 install or is it?

    and last one

    7.) C1-52 Crank Voltage. Hook up to where?

    Any input would help thanks
    Cliff Naylor

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    Hey how goes the harness work? I recently finished the same harness and got the car running. If you still need help let me know. Good luck.

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    Quote Originally Posted by DIY T/A View Post
    Hey how goes the harness work? I recently finished the same harness and got the car running. If you still need help let me know. Good luck.
    New to the forum and am doing a 05 got harness also, I have the same questions as cwnaylor thanks

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    I have a gto 05 I put in a55 chevy it will not crank at key will at starter.I have no spark or injectors ,all gto wiring .I need help.

  5. #5
    Registered Member fitz's Avatar

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    Quote Originally Posted by Tommy R View Post
    I have a gto 05 I put in a55 chevy it will not crank at key will at starter.I have no spark or injectors ,all gto wiring .I need help.
    The anti-theft software in the ECU becomes active when the ECU is powered up after a swap and it can not handshake with the body controller from the donor car. That shuts down the fuel pump, injectors and the starter. Most tuners can disable that 'feature'.

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