encoder or what?
 

ok i have a 1997, blazer 4x4, truck at first wouldnt take off in first ooo its a automatica, ok i tried to put it in 4x4 lo and hi it all was clickin the encoder and the tccm but wouldnt go in to either 4x4 setting. i reset the pcm with a scanner i have, i got 2 codes one was a solenoid in the trans , and one from the tccm, but i did get the trans to work fine now, but now the tranfer case wont shift, the tccm clicks but no sound from encoder, i will check the wires at the encoder for voltage tomrrow. 5 volts right? any help i would be thank full.

this may help

https://blazerforum.com/forum/tech-a...ill-help-7180/

its a laundry list of 4x system diagnoses

4x4 fuse
 

i keep blowin the 4x4 fuse in the panel could it be the encoder motor is bad?

Your on the right track, check your wires for corrosion and volts and post back.