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  •  » 1968 fastback (non gt non tach) Under Dash Harness Confusion.

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    3/11/2020 5:57 AM  #26

    wsinsle
    Senior 24-7 FYI Addict

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    From: Belle Vernon, PA
    Registered: 4/01/2013
    Posts: 1,703

    Re: 1968 fastback (non gt non tach) Under Dash Harness Confusion.

    Look at the gauge print Bolted posted. There is a 30 wire, Black w/green stripe. If I'm thinking correctly that feeds a switched 12 volts to the 5 volt voltage regulator. The 5 volt feeds that gauges. This should be OK to use, being switched your tach is not hot when the key is off. Keep in mind the 5 volt side is not actually 5 volts, it's a pulsed 12 volt that averages 5 volt.

    If this forum can't fix it, it isn't broke.
     

    3/11/2020 6:10 AM  #27

    Bolted to Floor
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    From: Houston, Texas
    Registered: 4/01/2013
    Posts: 2,017

    Re: 1968 fastback (non gt non tach) Under Dash Harness Confusion.

    Have you checked wire #30 that feeds power to the constant voltage unit in the drawing I posted?? That should give you a switched 12 volt lead. 

    Have you purchased one of these yet?? The drawings listed at the Average Joe's site do not show all of the wiring for the car. 
    https://johnsmustang.com/products/1968-mustang-electrical-assembly-manual?variant=25081511477312


     

    John  -- 67 Mustang Coupe 390 5 speed
     

     

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