tail light fuse after being on for a little bit

[muddin82]

I have a 1983  chevy pickup and after you turn on the head lights it will blow the tail light fuse. IT does not do it as soon as you turn them on but it will after they are on for alittle bit and when it blows the fuse it pulls enough power to dim the headlights and makes the alt. belt squeal. Any help would begentle appreciated. Ty for looking

[Irish_Alley]

rae you just sitting still or are you driving? about how long does it take?

[muddin82]

It is usually any where from 5 to 15 minutes and it does it driving down the road i havent tried it sitting still yet

[Irish_Alley]

sounds like you have a wire chafed somewhere, then it arks on the frame or another wire and causes the high draw and blows

[Irish_Alley]

might help

[rich weyand]

Sometimes they get melted together where they are too close to the exhaust if either the exhaust or wiring paths were messed with.  We had one of those a couple months back that shorted light hot leads to each other.  This sounds like the TL hot lead is shorting to the frame rail somewhere, intermittently, when the truck is bouncing and vibrating.