Atwood 8535 blowing fuses

I have an Atwood 8535 -IV- DVLP. It turns on and the blower motor runs like it should, then the ignitor lights fire. It runs for about 5 seconds and then blows the fuse so somewhere the voltage is building or something is grounding that blows the fuse.

I recently replaced the blower motor as the bearing went out and then replaced the board and the on/off switch that is located in the furnace frame. I don't find any bare wires getting grounded.

Only thing I can think os is the motors winding is bad?

Suggestions?