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Installing aftermarket Cruise - wiring problems

Discussion in 'GM Electrical Tech' started by dnaraG_1M, May 27, 2011.

  1. dnaraG_1M

    dnaraG_1M New Member

    Hello all,
    This is my 1st post (hope I'm in the right forum!) and I'm looking
    for some help with a cruise installation. My recently acquired van
    is the Plainest Jane of all, with zero options so I'm adding one or two.

    2005 G3500 Express Cargo Van. 6L with auto. Std wheelbase.

    The mechanical install went well with the cable from the servo box
    installed at the Throttle Body next to the cable from the GoPedal.

    I have located all of the electrical signals but two. Can't find VSS
    and TACH. I bought a Haynes manual for this van, but it is worse
    than useless - no schematic or pix of those signals. They must go
    to the computer under the hood, but I'm clueless as to which wire.
    Being temporarly mobility limited, I can't crawl under the beast or
    I could follow the wire (VSS) from the Xmission. TACH? I wouldn't
    know where to begin to look.......

    Sure hope someone can help me to find them.
    My thanks in advance.

    [I have wondered if all option levels of the same model have the ]
    [same cable harness. Would make sense. If so, there should be ]
    [a connector for the factory cruise - with the proper signals. ]
    [Does anyone know if this is true....or false? ]

    cheers,
    johnd
  2. Crawdaddy

    Crawdaddy Moderator Staff Member Platinum Contributor 1000 Posts 100 Posts

    I imagine you're going to have an interesting time finding a tach signal. I'm not familiar with the 6.0, but something tells me it's distributorless. For VSS, you should be able to pick that up off the tailshaft of the transmission.

    Out of curiosity, why didn't you add the factory cruise in? Seems like that would be a pretty simple plug and play setup, and it'd all be factory and integrated with the truck.
  3. dnaraG_1M

    dnaraG_1M New Member

    >I imagine you're going to have an interesting time finding a tach signal.
    >I'm not familiar with the 6.0, but something tells me it's distributorless.
    Yes, no distributer. However, the computer *knows* how fast it is making
    the engine run. I _suspect_ that there is such a signal, but where it is
    routed, I couldn't guess.....

    >For VSS, you should be able to pick that up off the tailshaft of the transmission.
    As I said - tempory mobility impairment. Can't crawl under the beast for a few months
    most likely....Ugh!

    >Out of curiosity, why didn't you add the factory cruise in? Seems like that would
    >be a pretty simple plug and play setup, and it'd all be factory and integrated
    >with the truck.
    Bought used, no cruise.

    I don't know if the wiring harness is set up for retrofit of factory cruise.
    ....Thus, my question about the harness asking that very question......

    cheers,
    johnd
  4. silveradotrailblazer

    silveradotrailblazer New Member 1000 Posts 100 Posts

    Welcome to the club. Good luck with your project.

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