Tie-up your tank sensor wires....
So I'm sanitizing my water system today.....first I marinate the fresh water tank, pipes and HW heater....after a few hours of that - I transfer the bleach solution to the gray tank and let it marinate.
Check the tank monitoring system during the gray water fill-up ....empty - nada - never moves.
Check underneath and my tank sensor wires are laid to waste....hanging, broken and missing sections.
For (2) years they have been hanging down (not tied up at the factory) and I kept telling myself....you better tie them up
Last trip of the season last year we were leaving the campground and I ran over a large stick that the TT tire kicked up....I heard the bang in the TV....the culprit I'm sure.
It took about (2) hrs to solder in new sections and tie everything up....lesson learned...