Positive wire burnt going to 12v

Discussion in 'Wiring' started by jaime f, Aug 9, 2020.

  1. jaime f

    jaime f Member

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    hi

    Bought a used 2007 Jayco jay series 1007. Went camping with a new battery. Turned on the interior light and the red wire going to the battery set fire. The fuse section was on fire and completely
    Melted. Any idea why this would happen??? Thanks!!!
     
  2. A-Ranger12

    A-Ranger12 Active Member

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    If it was just the light by itself, that's a symptom of a bad connection somewhere along the way. The fuse did it's job, just in a dramatic fashion.

    I'd start at the battery and inspect all the wire connections. Inspect the condition of the wire. It could have rubbed through and shorted somewhere. Or, someone replaced a 10 gauge fuse holder with a much smaller one.

    And, go through the camper to make sure all the electrical connections are secure. If any look janky, redo them.
     
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  3. tombiasi

    tombiasi Well-Known Member

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    Sounds like you direct shorted the battery. The fuse didn't work or there would not have been such a dramatic event. Start with the light you turned on.
     
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  4. jaime f

    jaime f Member

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    Thanks for the time with reply.
    The light worked fine when I plugged it in to an extension cord that went to my house. So could it still be my light?
     
  5. jaime f

    jaime f Member

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  6. jaime f

    jaime f Member

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    Thanks for the time with reply.
    The light worked fine when I plugged it in to an extension cord that went to my house. So could it still be my light?
     
  7. Sjm9911

    Sjm9911 Well-Known Member

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    You said new battery , how did you hook it up?
     
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  8. jaime f

    jaime f Member

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    I attached the red wire to the positive and the white to the negative.
     
  9. Sjm9911

    Sjm9911 Well-Known Member

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    Thats right. Make sure you didnt have another wire on one that isnt conected. I figure if it worked before, maybe you lossened something when you installed it. Sorry, all i can think of.
     
  10. jaime f

    jaime f Member

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    It worked before when I used the 30amp cord. I attached that to the electrical at my house. When I tried the battery out for the first time, that’s when the fuse set fire.
    Could this have anything to do with the kill switch?
     
  11. rabird

    rabird Howdy!

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    was the fire at the fuse near the battery? did the fuse touch the frame?
     
  12. jaime f

    jaime f Member

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    Yes the fire was at the fuse near the battery. The fuse might have touched the frame. Before leaving on our trip, We had to cut the red wire cause it wasn’t in good shape. The fuse ended up being about 1 1/2 inches away from the small eye connecter. (That round metal piece I attache to the positive terminal). So are you saying that if the fuse was touching the frame, it could set on fire?
     
  13. WrkrBee

    WrkrBee Well-Known Member

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    That would be a direct short. Depending on which terminal on the fuse touched the frame, it could have been an unfused full discharge.
     
  14. netslacker

    netslacker Member

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    Sounds like it’s the direct short of the positive to the frame of the trailer. Think of the frame of the trailer as one big negative wire going to the battery. If the positive wire touches the frame anywhere it’s a direct short of the battery. Sounds like it happened on the battery side of the fuse which explains why the fuse didn’t pop to protect the wiring.
     
    Last edited: Aug 10, 2020
  15. rabird

    rabird Howdy!

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    a pic may be worth a thousand words but generally the neg of the battery is connected to the frame so if part of the fuse near the battery touched the neg or the frame it would be a short.
     
  16. jaime f

    jaime f Member

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    The fuse wouldn’t have touched the frame of the trailer. It’s too short for that. But it could have been sitting on the top of the battery (sorry that’s the frame I thought you were referring to). Could this have caused the problem.
     
  17. WrkrBee

    WrkrBee Well-Known Member

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    Unless it was long enough to touch the negative battery terminal, no.
     
  18. jaime f

    jaime f Member

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    It was too short to touch the negative battery terminal.

    Any other thoughts? You guys are great.
     
  19. rabird

    rabird Howdy!

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    what type of fuse and its rating?

    anywhere the red wire does not not have its covering and touches the frame would cause a short but the fuse should prevent high current short.
     
  20. mpking

    mpking Well-Known Member

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    I think we're going to need a picture. We can guess all day, but it sounds like something isn't as it should be.
     

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