Good luck on finding the problem. It took me 5 years to find an intermittent blinker fuse problem on my old Jeep!
It would blow anywhere from two to three times per day, to 5 months without blowing.
After the first year, I replaced the fuse with a dash mounted push-to-reset circuit breaker.
That way, when it blew, I just pushed the breaker button back in and kept going. I kept thinking it would someday get worse so I could find it.
One day, I was working on some rattles, and found it. Those old Jeeps had a hump in the hood over the radiator. There was a piece of felt/fabric riveted on the body across that to keep the hood from rattling.
Somehow the wire going to the right front blinker light had gotten embedded in that material so far it was invisible.
It was laying on one of the rivet heads, but the fabric held it off enough so that it did not touch normally.
When I hit a hard bump, the hood would compress the fabric down and slam the wire into the rivet.
Eventually it wore through the insulation, but could only touch when the hood was pressing it down.
Of course, there was no power there except when the blinker was on.
So, the only time it blew the fuse, was when I hit a bump hard enough for the hood to press the wire into the rivet for a split second, at the exact second the right blinker was on.
No wonder it took so long to find it.........
