99 Pete 379 No speedo & No tach

Discussion in 'Trucks [ Eighteen Wheelers ]' started by brenes-built, Mar 4, 2012.

  1. brenes-built

    brenes-built Light Load Member

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    Apr 14, 2011
    Vancouver, Wa
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    All of a sudden both went down... The tach is buried straight down between 0 & 30. My speedo is just under the 0 and they don't move when I turn the key switch or start the truck... I also notice none of the alarms on the cluster light up? Any suggestions.....?
     
  2. bigyellowpete

    bigyellowpete Bobtail Member

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    Dec 18, 2010
    Behind The Wheel
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    I'm thinking you lost the ground someplace. I can't remember which # the wire is on the harness, but if you pull your dash panels out and start looking around in there, you can check the obvious grounds fairly easily. Sometimes you need the arms of a 6 year old to reach some of them though.
     
  3. truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
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    Check acessery fuse in the fuse box if its not blown check your acessery relay its behind the little dash panel on the left there will be two black boxes mounted together wit two screws and some heavy gauge wire the one on the left side is the acessary relay it will have four wires going to it two heavy gauge and a plug with two wires you can jump the relay where the two heavy gauge wires connect and all should work that relay controls the whole right side of your fuse box common for going out on a Pete if you have the rounded dash which I think 99 was still the square dash it will be right behind the steering colum they both kinda pia to get to
     
    blairandgretchen and brenes-built Thank this.
  4. brenes-built

    brenes-built Light Load Member

    157
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    Apr 14, 2011
    Vancouver, Wa
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    One fuse in the fuse box was burned out, but still nothing after replacing it.. I opened the left side and center of dash found three fuse holders tested out good but still NADA.. I see the box your talking about...but that had power, am I missing something??
     
  5. truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
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    Did you jump the heavy gauge wires the relay goes out often that will tell you then when you jump it all the warning lites should come on
     
  6. brenes-built

    brenes-built Light Load Member

    157
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    Apr 14, 2011
    Vancouver, Wa
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    If by jumping the wires works, where is that relay located so I can replace it? Thanks
     
  7. truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
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    That is the relay where your jumping the wires little box with two heavy gauge wires and a plug with two small gauge wires the small gauge wires turn that realay on when the key is on so just put a jumper wire between the two heavy gauge wires if that dosent work you might want to pull the fuse block and check behind it petes have a tendency to have leaky windshields and the back of the fuse box carrodes
     
    blairandgretchen and brenes-built Thank this.
  8. brenes-built

    brenes-built Light Load Member

    157
    11
    Apr 14, 2011
    Vancouver, Wa
    0
    Okay just jumped the heavy gauge wires and nothing.. It's the cluster thats screwed down behind the dash panel on the left? It has four points where wires are screwed into.. Is there anything by the firewall I've been running through montana a lot and this happened about five hours after I washed the truck...
     
  9. brenes-built

    brenes-built Light Load Member

    157
    11
    Apr 14, 2011
    Vancouver, Wa
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    Thanks for your responses... Just one more thing because I'm about to take it to the shop... If the circuit breaker is bad wouldn't the new fuse only have current on one side of it? Because it's showing current on both sides....
     
  10. truckmechanic

    truckmechanic Medium Load Member

    534
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    Jan 14, 2012
    Hi Desert Ca
    0
    No the fuse is what turns the relay on and of with the key switch the relay controls the acessary side of the fuse box
     
    blairandgretchen Thanks this.
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