91 c1500 5.7l V8 tach connection

Discussion in 'Chevy C/K Truck Forum' started by blackdog62, Nov 29, 2010.

  1. blackdog62

    blackdog62 New Member

    Hi, on my 5.7 v8 i have the divorced coil on the ignition and it has 2 plugs with pink and white wires on each plug. Where would I connect the green tach wire on this coil and would it be on the plug which goes to the distributor or the other. Thanks and great forum
  2. stephan

    stephan Rockstar 4 Years 5000 Posts

    Your tach wire goes on the (-) negative side of the coil. It would be the same one that goes to the distributor. Look close, it should be marked - or "negative". The other side of the coil is the supplied 12Volts "in" & powers the coil.

    The reason I say look closely is because a coil will work even if it is wired backwards, so you should check this first before you hook up your tach.
    Last edited: Nov 29, 2010
  3. Chris Miller

    Chris Miller Rockstar 100 Posts

    Actually, if you follow the wiring harness away from the coil a bit, you'll find a terminal on a white wire. That's the tach lead.
  4. blackdog62

    blackdog62 New Member

    Thanks for the info, there is a terminal on a white wire on the coil but its on the one that does not go to the distributor

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