99 Sub T Case fuse blowing

'99 Sub, K2500, 7.4, Auto 2-speed transfer case. The "TCase" 20 amp fuse blows intermittently. I have replaced the encoder motor and the shift control module ($800), no help. I have rung out every wire for shorts to ground and shorts to each other. Nothing. Could there be something mechanical in the t-case that is causing the encoder motor to overload? Also thinking of splicing in a new power feed wire to the t-case. :banghead:

check your wires to your ifs solenoid in the front differential. and the wires that go to the front diff also run past the exhaust system on the right side of the engine. make sure you don't have a bare spot in those areas.