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  1. #1
    Join Date
    Aug 2009
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    new modded harness

    hey guys can some one help me please i just got my harness back today and it dont fit right !!!! if i connect the ALT plug there is no way the wires streach to the fuel injectors i looks like a mess pretty disapointed in the workmanship
    so here is what i wanna know
    (1) on the drives side which color wires go to which injector
    (2) where does the temp sensor plug in
    (3) where does the crank sensor plug in
    (4) which 02 sensor is left and right!!!
    i dont even know how the wiring lays over the engine its out of a 2000 tahoe
    there seams to be about 3 grounds where they go???
    thanks

  2. #2
    Join Date
    Nov 2003
    Location
    Denton Texas
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    wiring diagram to locate colors for injectors...
    http://www.ls1truck.com/forums/194825-post2.html
    black #1
    pink/black #3
    black/white #5
    red/black #7

    grounds go to the back of the drivers side head, all three or one can go to the bolt hole just to the side of the cam sensor.

    water temp sensor plugs in at the driver side head, just in front of the exhaust manifold.

    Crank sensor is located just above the starter solenoid on the passenger side of the block.

    02 wires will be easy to tell by the PCM wiring diagram. One side has stripes on the wires and the other doesn't. (striped side to driver side, #1 cylinder side). I'm assuming the drivers side is the left side of the vehicle as view from the driver seat looking out the front window.
    Last edited by RedHeartbeat; 10-17-2009 at 03:56 PM.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
    Join Date
    Nov 2003
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    Denton Texas
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    We want to know who did the conversion to your harness, too!
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  4. #4
    Join Date
    Aug 2009
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    121
    fantastic ok i conected the crank sensor by removing the starter so thats done now here is the kicker the temp sensor plug was sitting on top of the manifold at the rear by the knock sensor there was no way i was going to connect it so i had to undo the cappy tape work and that pipinging that houses it and free up the wires till i had enough so i can plug it in into the head!!! MAN!!!!
    SO now i see that the O2 are on the right side so thats cool
    so i went to put the vortec cover back on and there was no way it would sit on the engine so i took off the plastic piping that runs across the manifold adnd did a nice tape job now it sits in fine
    i will take a pic of the rest of the harness coz i wanna fire this thing up
    !!!!
    just need to double check the fuel injectors wiring on the drivers side thats got me confused!!!

  5. #5
    Join Date
    Aug 2009
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    121
    ok here are the colors of the drivers side injectors
    looking at the engine on the driver side the first injector closest to the Radiator is
    PINK/ BLACK
    THEN
    PINK/PINK
    THEN
    PINK/ BLACK WITH WHITE STRIPE
    THEN
    PINK /RED WITH A BLACK STRIPE
    IM confussed!!

  6. #6
    Join Date
    Nov 2003
    Location
    Denton Texas
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    The pink wire is the 12v power going to the injector. The wires I listed below are the injector ground side wire going back to the PCM. Sounds like they are wired correctly to me.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  7. #7
    Join Date
    Aug 2009
    Posts
    121
    ok so i went out to the truck this morning and took out that plug on the PASS side here is a pic below the adapter srews into this right??
    ok the second pic shows what i think your talking about do i pull this off and tap out the hole???

    as for the ALT there is a black wire that goes to a red box on the side of engine this wire is connecr to the POS terminal wire for the battery
    on my truck harness there is a ALTwire tooo
    Attached Images

  8. #8
    Join Date
    Nov 2003
    Location
    Denton Texas
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    yes and yes.

    The main Alt power lead is good. The connector going to the Alt, how many wires are in that connector? BTW, what year and size engine is this?
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  9. #9
    Join Date
    Nov 2003
    Location
    Denton Texas
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    here is an alternative to using the hole in the back of the head. I drilled and tapped the waterpump for the original sensor.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  10. #10
    Join Date
    Aug 2009
    Posts
    121
    the engine is out of a 2000 tahoe 5.3, the ALT plug has 2 wires gray and brown but there is 4 pins on the ALT where this plug goes into
    my truck was a factory diesel truck (1978) there seam to be more than normal wires the is one thick one thats for fuel solinoid and another that is red that goes to a juction on the firewall ???

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