Ok, our 2005 Dodge Dually 3500 Cummins Diesel is dead in the driveway. Need a sense of what direction to go. Tried calling Dodge for some support and they were useless.

To begin, over the past 2 months there were weird issues occurring but they literally fixed themselves when truck was turned off and back on. Examples of issues: power windows and heat fan not working (fuse was fine); Not shifting out of 1st gear (trans fluid fine) restarted truck and it shifted normal. Both batteries have full charge - but it just won't crank over. The starter and alternator are ok.

Does anyone have wiring skematics or can you suggest where to begin?

Thanks in advance!