Help! Lance 850 isn’t getting power from truck battery

All sorts of personal events got in the way of me providing an update, but all is well now so here it is:
I replaced the 40 amp mini breaker that the pigtail connects to when it first enters the camper. Then I futzed around with the Separator unit to check connections and the fuses. It’s a BlueSea Systems unit under the dinette bench.
Presto, everything works as it should again!
So, all is well and I am currently out boondocking in Utah.
Thanks to all who ventured opinions and hypotheses!