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Thread: GM TBI conversion on a 304 CJ-7

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  1. #1
    Electronic Ignition! Texasdave's Avatar
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    Okay, basic question. My Jeep did not come with a check engine light so when I'm wiring in the TBI conversion do I need to wire in some sort of light?

  2. #2
    Super Moderator dave w's Avatar
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    Yes.

    The computer will supply the "Ground" to the check engine light when there is an error. The other wire of the light is connected to the ignition switch ("On").

    dave w

  3. #3
    Electronic Ignition! Texasdave's Avatar
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    Working on the wiring harness and and I am unsure of which wires I need and which I don't. I have two multi-port plugs in the wiring bundle that connects to the wiring bundle inside the vehicle (1990 Chevy Pick up donor vehicle). DO I cut these out? I think I should but I'm unsure what they connected to inside the cab. I feel like a bomb tech do I cut the pink wire or do I cut the green/black wire. Only good thing, at least I won't blow myself up.
    Last edited by Texasdave; 03-22-2016 at 07:24 PM.

  4. #4
    Super Moderator dave w's Avatar
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    Figure out the ECM wiring first, here is a link to the 1227747 wiring schematics: http://www.gearhead-efi.com/Fuel-Inj...Information-42

    dave w

  5. #5
    Electronic Ignition! Texasdave's Avatar
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    When I removed the wiring harness it had a bulkhead connector, or at least I thought it was. In reality the wires go straight through and are covered by this plastic goop. I heated the goop and it melted allowing me to separate the wires. This makes it easier to work with them. BTW I was careful not to get it so hot that it melted the wire coating.

  6. #6
    Fuel Injected!
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    Quote Originally Posted by Texasdave View Post
    When I removed the wiring harness it had a bulkhead connector, or at least I thought it was. In reality the wires go straight through and are covered by this plastic goop. I heated the goop and it melted allowing me to separate the wires. This makes it easier to work with them. BTW I was careful not to get it so hot that it melted the wire coating.
    Yep, that's the fun part!
    1973 K-5 Blazer, TBI 350, TH400, 1 ton axles & 38" SSRs'
    1975 280Z, TBI 350, 700R4
    1953 M-38A1, TBI Buick 231
    1951 Ford Panel, 5.3 with 4L80E

  7. #7
    Electronic Ignition! Texasdave's Avatar
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    Because I cut the wires short to the ALDL I am going to have to add some wire to be able to mount it. What is the preferred method? Soldering and shrink wrap or unpinning from connector and crimping new wire?

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