2002 GMC Sierra 2500 HD Q&A

2002 GMC Sierra 2500 HD Question: 4wd inop

4wd inop disconnected batterys and reconnected no change put in new dash switch no change, dash switch not lighting up service 4wd light comes on -
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replaced electric dash switch already but still not lighting up and fuses are good and 4wd still not working first it wouldnt go into 4wd then it would"nt come out of 4wd then I disconnected the ba...