Mid conversion just installed aux battery, fans, isolator. Started up normally to test battery isolator then shut off on its own. Thought that was weird so I plugged in an obd2 reader and got p2506. Truck ran for another 10 minutes and just shut off randomly. Went to start up again and it ran enough to run up to the store and back before shutting down for the last time. Now I don't get anything when the key is turned. No dash, clicks, buzzes farts...nothing. The clock will occasionally turn on and beep at me when the door is open but that is all. I've checked battery good and all connections. Replaced/cleaned negative battery cable and engine ground. Disco'd all aux battery functions. Still no lights no start no click. Checked for parasitic load and found nothing. Been all over google and here chasing relays, fuses, grounds, fuse blocks, switches and other assorted electrical bits. I'm extremely frustrated as it looked like it was working and then just died the next day. Help?