Bought a truck that didn't make it home. What's known: No trouble codes at eng., trans., t-fer case using snap on MT2500 scanner. No open fuses. Scanner does show "3v ignition = 0v" at t-fer case on scanner. With motor running and gears selected(P to R or N to D, I can hear the engine idle down, as if the trans. is engaging, with no reaction from the T-fer case. I can hear the lil motor(encoder?) acting when moving the auto-4hi-4low buttons on left of dash. So... I'm going to verify the loss of 3v, where ever that is, but was hoping someone has seen this before, and lend me some advise. Thanx for your time!