fuse for running lights keeps blowing

[jdix]

I have a 2007 Basecamp and the fuse for the running lights seems to blow within a day or so of replacing it. There are very few visible wires to look for a short and I'm afraid there might be a short buried where I can't see it. Any ideas? It's been fine for years, now suddenly this occurs.

[ROBERTSUNRUS]

Hi, are you using the right sized fuse? Have you changed or repaired any trailer lights before this started to happen? Have you made any changes to your trailer where you have drilled a new hole or mounted anything with sheet metal screws? When I was fixing electrical systems on cars, the problem was almost always the last thing done to it before the problem started. [no matter how unrelated it may seem to you] Something as simple as replacing your license plate could have pinched the license light wire.