Will not shift into 4 wheel drive?

4WD light blinks will not shift to 4hi or 4lo just blinks, 2wd light stays green. Replaced encoder motor with brand new one, replaced TCCM with junk yard tccm from exact same truck, also tried a different shift knob from junk yard (think that one is bad 4hi does not light up). Have 12v to shift motor 2pin plug 5v to ecoder plug. Transfer case, can use wrench to shift into 4hi 4lo 2hi neutral, plugs all look really good with no corrosion wires all look reallg good not broken or corroded. No codes, scan tool nothing in memory. Checked fuses and relays all good. Going to try another tccm, shift knob and check every single fuse next. At a complete loss at this point please help. Thanks.