Running lights pop 20A fuse on truck

[njreyn]

Greetings all,
Having a problem with our '04 Keystone Tailgator. The running/marker lights will stay on for somewhere between 9 and 10 minutes, then pop the breaker. I can almost set a watch to it. I've taken apart and cleaned the ground point to the trailer, no help. Short of using a heavier fuse, any ideas on how to nail down a cause? TIA
Nelson

[wingnut60]

Would you be able to pull each bulb one at a time and see if any of them being out will keep them on?
These type problems will drive you batty--and could be expensive due to the time a mechanic will need to trace it.
Good Luck.
Joe

[njreyn]

Would you be able to pull each bulb one at a time and see if any of them being out will keep them on?
These type problems will drive you batty--and could be expensive due to the time a mechanic will need to trace it.
Good Luck.
Joe

There's an afternoon! But it's not a bad idea. Thanks.