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SOUND LIKE ALTERNATOR NOT CHARGING BATTERY,WITH ENGINE RUNNING CHECK BATTERY VOLTS AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS.IF NOT ALTERNATOR NOT WORKING CHECK ALTERNATOR BATTERY POWER FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE AND LOOSE CONNECTION. CHECK ALTERNATOR FUSE.BEFORE REMOVING ALTERNATOR.TURN OFF RADIO FIRST BEFORE REMOVING THE NEGATIVE BATTERY TO KEEP FROM LOCKING OUT RADIO.
the electric shift motor on transfer case is bad, replace and it will work great. if your at all mechanically inclined you can do this very easy. before unbolting motor disconnect battery to reset computer install part, should only take you 15 min maybe then hook up battery and you will have 4 wheel drive again. good luck
Put an injector noid light at the injector plug terminals to see if your getting a signal from the PCM(computer).If not try to find a computer from the same vehicle that works and swap it into yours to check.A PCM swap will take about 15minutes.
I had the same problem with the shift on the fly push-button 4x4 on my 97 Suburban. GM Shop manual indicates that it could be due to an encoder error on the actuator motor. Try pulling the transfer case fuse to reset the transfer case control module. Wait at least one minute. Re-install fuse then re-try operation. Did it last week and that saved me a trip to the dealership and extensive troubleshooting.