Columbia lost all electric power

Good evening guys,

I have an 05 Columbia with a cat c-15. It just lost all electricity and shut off on the hwy. Batteries, starter and alternator are all good. Battery fuse seems fine. Truck has no power and won’t turn on. Any idea what can be causing this problem? All grounds are tight and I tightened the batteries

 

It was the positive to the starter from the batteries. Tip broke off and the cable was tucked away behind the frame so I didn’t see it at the first go around trying to find it. Spliced it with the cable I had for the inverter to get me going till I get to a shop to buy a new tip for it. Thanks for the reply bub