95 blazer stuck in4 low and keep blowing 4wd fuse when i put the transmission in nuetral to switch it out of 4lo the problem is i change the harness for the 3 button switch on the dash the wires where loose then i fried the tccm in the dash and changed that with a 97 jimmy one i dont know if theres a difference in the two but i really need help i did the codes check and got code 1 then cleared it the tried it again now got code 3 dont know what to do

 

Were the PNs even close between the two? Did the 97 Jimmy have a 3 button switch?

Look at the Tech Article (DIY) post for "OBD2 Non-Automatic Transfer Case Diagnostics" for a code description.

 

yeah it plugged right in the harness for the tccm but it doesnt click unless its in nuetral and then blows the fuse for 4wd but all the other fuses are fine

 

whatsis the positive voltage circuit ckt 1640