thanks for the input.
I don't think internal harness is this case cause before my friend got the motor and tranny he test drove it (he was more interested in motor for snow plough unit). He also brought it to his tranny guy to test it (installed in my truck) trany guy said it was fine and to trace wires from tranny back broken wire somewhere. So I guess now I'm looking for a link to find out which wire should contain what voltage, ground etc...

thanks again people