Peterbilt 387 no guages

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Petertruckin387, Jan 25, 2020.

  1. Petertruckin387

    Petertruckin387 Bobtail Member

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    Jan 25, 2020
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    Help I have a c15 powered 2006 peterbilt 387. The guages have completely quit working no low air warnings nothing. The blinker indicator still works but no high beam or park brake indicator. I have cleaned every electrical part I can think of and replaced every fuse and relay I could find. Any help would be greatly appreciated
     
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  3. Deere hunter

    Deere hunter Road Train Member

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    Did your cab heater blower quit working also?
     
  4. Petertruckin387

    Petertruckin387 Bobtail Member

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    No but the sleeper blower motor did
     
  5. Deere hunter

    Deere hunter Road Train Member

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    Well mines a 2000 379 behind the left side of the dash is a electrical relay that runs all your gauges that may not be the case in your truck some of The newer trucks all the gauges go through the ECM not sure what year that started but if it is the relay behind the dash a hot wire off the key activates it .
    something might be wrong!
     
  6. Petertruckin387

    Petertruckin387 Bobtail Member

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    It's not even cycling the relays before it starts. Ya know the clicks I'm talking about
     
  7. Deere hunter

    Deere hunter Road Train Member

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  8. Deere hunter

    Deere hunter Road Train Member

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    Yes
     
  9. Old Man

    Old Man Road Train Member

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    One of the clicks you hear is the relays that close to power the dash, heater fans and wipers. the big relay uses a small one to close it, usually mounted back to back behind left side of dash
     
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  10. Petertruckin387

    Petertruckin387 Bobtail Member

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    Jan 25, 2020
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    Thank you I'll look there in the morning
     
  11. Chris M.

    Chris M. Light Load Member

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    I had this issue. It’s the power wire to the board. The first wire let’s you run the truck and the second positive wire from the left operates the gauges. It’s the top center plug. Be careful and not to man handle the board. It’s behind the jockey box.
     

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