2010 4900 no power to controls in bunk

Discussion in 'Western Star Forum' started by Ski125, Jun 19, 2020.

  1. Ski125

    Ski125 Bobtail Member

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    Aug 22, 2017
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    My 2010 western star 4900 now has no power to the controls for the A/C, heat and bunk blower motor. I seen the wire was burned out to the blower motor so I replaced the wire and thinking it may have been the blower motor I replaced that to. Nope, still not working, checked all the fuses, all good. To make a long store short, I think I replaced everything and still not working, any ideas? I am ready to sell this pile of junk.
     
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  3. RocketyMan

    RocketyMan Medium Load Member

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    Have you tried looking up wiring schematics to actually verify pwr, gnd, etc.?

    What's last 6 of your vin?
     
  4. BUMBACLADWAR

    BUMBACLADWAR Road Train Member

    1,807
    1,726
    Dec 5, 2013
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    Ah yeah. Maybe blower motor pulling too much amps melting wires? Did you you replace same gauge wires. Id replace blower motor.
     
  5. BUMBACLADWAR

    BUMBACLADWAR Road Train Member

    1,807
    1,726
    Dec 5, 2013
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    Oh, replaced blower motor...Is there oil leaking onto a ground or sticky relay,battery cable corroded inside.
     
  6. Ski125

    Ski125 Bobtail Member

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    Aug 22, 2017
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    Today I am going to check the ground wire. Also, is there a relay in the fuse panel to the bunk switches? I found 1 relay under the drawers and I did replace that one but still nothing. Maybe bad on/off switch in bunk control panel?
     
  7. Ski125

    Ski125 Bobtail Member

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    Aug 22, 2017
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    I sent you my last 6 of my vin, look in your conversation or truckers Report email.
     
  8. RocketyMan

    RocketyMan Medium Load Member

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    Sorry for the delay. I was ill yesterday. I'll get you some wiring schematics real quick.
     
  9. bad-luck

    bad-luck Road Train Member

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    Nov 16, 2013
    Baltimore, Maryland
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    Do you have a test light? You need to see what is getting power and what is it here again I'm thinking that you probably blew a fuse be could that wire was melted. There must be a fuse somewhere else
     
  10. RocketyMan

    RocketyMan Medium Load Member

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    @Ski125 Looks like F71 controls power to AUX HVAC. In addition, you have TWO relays that ALSO control power to these components. If there was a suspect over-current, then you will also need to inspect the relays as those could've easily burnt up in the process.

    upload_2020-6-23_8-9-4.png
     
    QUALITYTRUCK Thanks this.
  11. Ski125

    Ski125 Bobtail Member

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    Aug 22, 2017
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    Update. It was a ground wire behind the fuse panel under the bunk. The wire must of come loose after all these years bouncing down the road. Tightened it backup, all the power was back and now all is good. Thanks for everyone’s help.
     
    uncleal13 and RocketyMan Thank this.
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