I fear this may be an unresolvable problem. The number 1 fuse blowing, which is the instrument lights, right parking lights. It will work fine for a day or two, even several hours of constant use, then seemingly without cause it will blow. Been through four already. Recent electrical work has been replacing the headlight switch, but that was months ago and this problem is only a couple weeks old. Ideas?

Also, perhaps related or not, a device I power through the cigarette lighter is immediately blowing its power supply fuse when i plug it in. There is nothing wrong with the device, it works fine in another vehicle. The lighter power is not on the number 1 fuse circuit, so it is powered when that fuse blows. Idea? Bad connection? Corrosion on contacts?