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gps blowing fuses

When I use my gps in my truck using the cigarette lighter everything is fine but when I use a small 12 volt battery with a cigarette lighter adapter attached to it ,I blow the fuse in the power cable. I checked the adapter for shorts and found nothing wrong. Can anybody help me.


  • alanb 555 Points
    Any chance you have it wired backwards? I think the tip should be positive and shaft negative.
  • joepeg 1 Point
    That was it. when I put a new adapter on that small 12 v battery I didn't think it make a difference, but I guess it does. I went through a bunch of fuses trying different things.
    Thank You, alanb
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