Turn signals not working, blowing fuse

I don’t know if you have tried this, but one thing I have done in the past is to put a tail light bulb in place of the fuse that is blowing. If you have a friend watch the bulb, you can wiggle wires around till the bulb lights up.

The bulb should be out, or dim with nothing on. It should be full brightness when you get a short. The bulb will limit the current so nothing burns up.

I used to have a burned out fuse with wires soldered on each end to hook the bulb to.

This is kind of a crude method, but sometimes you get lucky with it.