TK md200 code 35 no start, new board.

Unit was blowing the 15a F4 fuse(circuit 8)every few days. Fuse blows and flashes code 35, replace the fuse and you can hear it pop the second you turn the cab controller on. I was advised by a coworker to bypass the exc wire from alternator to the MP and it worked for about 2 weeks. Now it's back to instantly popping the fuse, I tried putting a new MP in today and it has the same problem.

I'm assuming it's a wiring problem but I don't know enough about electrical yet to troubleshoot and was wondering if anyone had experience with this situation.