Tail/horn fuse
I’m tempted to put a jumper wire in the fuse box and see what melts first, just so I can find this thing that’s cost me about 1 fuse per 100 miles. But I’d rather not
Worst idea ever. Unless you are trying to burn your car and garage down.
First if you don't already have one is a wiring diagram.
Just tracing out my 67 dart wiring diagram I can find a dozen places where a grounded wire would pop a fuse. Down at the brake switch is a very possible point of a pinched / chaffed wire that will have intermittent contact yo ground.
In the imprtal words of 67dart273 (I think!) "and now a story from my past"
Worked in FacOps. Building ac system would shut off randomly. Found that it always happened the day after a rain.
I suspected the wires in a conduit that was very close to where someone had done some open flame welding.
No one would listen to me... But I persisted till one of the engineers agreeded to look at it.
Took him 40 minutes to remove 6 wires from 8 feet of conduit. Sure enough all the wires insulation was melted together. The melted insulation made a dam and when it rained, a leaking j box let in enough water to fill and make a short tripping the system.
Moral to the story look for the easy stuff and for the stuff that makes sense.
BTW fuses protect the wiring not the device. If you have a 40 amp fuse on a 20 amp circuit you just turned the wire in the cir to a 20 amp fuse.
Another thing to look at is the corrosion In the fuse holder. If the contact area that the fuse touches is corroded if will create a point of high resistance and create more heat, and a higher current right there at the fuse.
