Case 750M no electrical power

I have a Case 750M LGP 2016. The oil light came on due to a leak so I added oil and started the dozer to bring it to the front for inspection. I moved it about 15 feet and it stopped and all power went out. When I cut off the key and tried to crank the engine I had no power to anything. I checked the batteries, fuses, and master switch but have found nothing. All the fuses are fine, I switch two of the relays but still no power to the dash. Any suggestions? Thanks