Fuse on top of the starter blows twice.

[rich b]

If you replace the fuse with a light bulb; you can use it to diagnose the wiring. If it is on you can disconnect circuits and when the light goes out, you can check thru that circuit and locate the short. If the light is out, you can go around and wiggle the harness, components, and connections and if the light goes on you can check it for the short.

Pretty easy to find if it's a hard short; little tougher if intermittent.