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Thread: Won't start after wired up

  1. #11
    Join Date
    May 2004
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    [quote=why would the transmission position not be illuminated in the gauge panel, any thoughts on that?[/quote]

    It has to be wired with the neutral safety switch to illuminate correctly.

    Also, did you wire up the oil pressure switch correctly from the old vortec? It has fuel shut off along with oil pressure, if it doesn't see enough oil pressure it cuts the fuel off. The LSX oil pressure switch just help satisfy the pcm.
    Last edited by NITROUS; 08-07-2008 at 09:13 PM.


    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

  2. #12
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    the Gauge indicator is powered through the neutral safety switch.
    It tells you if your in P R N D 3 2 1
    Make sure thats plugged in, for some reason on mine N D 2 1 don't light up.
    Good luck..

    here is a pic of the switch, it bolts to the tranny.

  3. #13
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    Didn't I just say that? LOL Good pic though............


    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

  4. #14
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    Quote Originally Posted by NITROUS View Post
    Didn't I just say that? LOL Good pic though............
    yea you did, i wrote that a long time ago, left my computer and came back noticing i forgot to post it

  5. #15
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    I'm just messin with you bro........................... BTW, this is RHB hugging you, not me......... I haven't messed with him lately either.
    Last edited by NITROUS; 08-07-2008 at 09:36 PM.


    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

  6. #16
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    Quote Originally Posted by NITROUS View Post
    I'm just messin with you bro........................... BTW, this is RHB hugging you, not me......... I haven't messed with him lately either.
    Dont taze me bro! lol i know its fun to mess around now go make my headers

  7. #17
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    I just need my goodies to get here! (Tooling)



    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

  8. #18
    Join Date
    May 2008
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    Kentucky
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    I didn't hook the 5.3 oil pressure up because I was under the impression it wasn't a must. I just hooked the factory oil pressure up into its place.

    Which wire did you hook the neutral/park wire to on the neutral safety switch?
    1996 GMC extended cab, 2003 5.3/auto

  9. #19
    Join Date
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    Quote Originally Posted by 468Blazer View Post
    I didn't hook the 5.3 oil pressure up because I was under the impression it wasn't a must. I just hooked the factory oil pressure up into its place.

    Which wire did you hook the neutral/park wire to on the neutral safety switch?
    on my swap i took the stock oil pressure sensor off the 1998 4.3 bought the 16mm adapter from Street and performance and removed the 5.3 oil pressure sensor and put the 4.3 one in. that way it reads correctly on your dash. i also used the 4.3 plug. and my pressure seems to read just fine.
    09 CREWCAB LTZ SILVERADO, 6.2, SIX SPEED, CAI,

  10. #20
    Quote Originally Posted by ChevyLee View Post
    the Gauge indicator is powered through the neutral safety switch.

    Not only is it plugged into the nelson harness, he tried plugging it to the old harness, then he took the old part off the original transmission and plugged it into the nelson harness, then into the stock harness....nada.


    So it would seem there is a problem elsewhere.


    Something else I noticed, the solenoid wire either from the stock harness or the nelson harness, neither get 12v with the key all the way forward (or to engage the starter)......its gonna end up being something simple thats gonna pis me off.
    LSX conversions, so easy a caveman can do it.

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