Question about Ford F-150

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I have a 1988 for f150 inline 6 auto tranny. as is right now the gas Gage, oil gauge,water temp gauge and battery gage do not work as well the radio does not work. any suggestions were to start besides buying a manual. more then Anny thing i just want the radio and gas Gage back. i check all the fuses by the driver side panel so any suggestions?

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  • rnwatson1 Aug 02, 2010

    and how do i go about ratein your advice?

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  • Ford Master
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The gages are in-op due to a failed instrument cluster voltage regulator most likely, the radio is not connected to that circuit, so u will need to use a 12 volt test light (avil from Kragen or autozone for $5) and recheck all the fuses that are less than 20 amps, u may have a fuse that looks good but is actually blown at the edge, a visual is not good enough, as far as the voltage regulator goes it is attached to the printed circuit board on the back of the instrument cluster, the part looks like a very short 9 volt battery and is connected to a connector that is a 9 volt battery connector, this is a very common failure in early fords.

Posted on Aug 02, 2010

  • 7 more comments 
  • rnwatson1 Aug 02, 2010

    i swaped out every fuse in the main panel with all new ones and tested them with a volt meter i dont think the issus is in the main box for the radio anny outher suggestions?

  • yadayada
    yadayada Aug 02, 2010

    U have my fix for the gage problem, There is one other thing that fials in this year, if u would car to call me i will explain 925-459-0571, my home, i am a ford dealer tech 35 years of wrenching.

  • yadayada
    yadayada Aug 02, 2010

    please rate my help for fixya so I am compenstaed for my time, thanks

  • rnwatson1 Aug 02, 2010

    hey could you give me the names of thos parts we talked about?
    the switch that the rod goes into and the regulator behind the gauges and so on? im going to go down to ford tomorrow and just replace everything that you mentioned tonight just to be safe i plan on useing this truck alot


  • yadayada
    yadayada Aug 02, 2010

    here is the part number for the igntion switch that is at the base of the steering column, also see picture



    STANDARD MOTOR PRODUCTS Part # US13 Ignition Starter Switch $6.76

  • yadayada
    yadayada Aug 02, 2010

    Igntion switch

  • yadayada
    yadayada Aug 02, 2010

    The part you may need for the gages is called the "IVR" it stands for "Instrument Voltage Regulator" and is located on the back of the dash cluster attached to the printed circuit board, see the Ford dealer (if your local Napa store or Carquest doesn't have them) for the exact one you need, they vary in design but the picture below is the last design and if MY memory serves me the picture below is your type of design used in the late 80's trucks. when u go to get the ignition switch ask if the parts store sells these, I think they do.




  • yadayada
    yadayada Aug 02, 2010

    My email is yadawho@astound.net if u have more questions about this repair.

  • yadayada
    yadayada Aug 02, 2010

    I did some more detailed year specific checking on the gage problem you have, your year of F150 DOES NOT USE AN IVR (Instrument Voltage Regulator), it was last used in 1986, so the problem you have is almost certainly the igntion starter switch failing. Also if u get the gages workiong but the gas gage still doesn't work u will need topullthe Gas tank and replace the Gas gage sending unit that is located inside the gas tank

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