97 4x4 ?

got some good info so far. i have a 97 blazer ls 4 door and my 4 wheel drive only works for like 2 days after i do a reset like disconect the battery it doesnt work if i just pull the 4 wheel drive fuse. what does it sound like it is. it will go into 4 low at least it feels like it. but it will not go into 4 hi unless i do the battery disconnect thing. and when i do the battery disconect thing 4 hi does work cause i took out in some mud. but after awhile it just stops working. is it 4 wheel drive computer, bad relays ? thanks much. ps checked vaccum lines to actuater and all the other vaccum lines. i found some info going to check it out later will post what i find.

kkk got a used tccm for about 60 bucks at a junk yard and now i hear a noticeable relay click when i put it in 4 hi and 4 low think that was it. we'll see cause the other one went into 4 wheel drive right after i reset it, at least the light lit up, but i dont remember a relay click.


new tccm did the same thing now i guess i will goto the encodermotor. took the new tccm and put my old one back in