Thank you.
ALL OF US Owners need to regularly get under our rigs for such inspections. And its a lot easier to do so in a relatively safe & dry environment versus a way night on the side of a busy highway.
A couple of years back after installing a DC Fridge that appeared to be malfunctioning both myself & my RV Guy crawled under & discovered that I had a long standing Negative/Ground wire issue that was intermittment.
Fortunately he was with me as I didn't know what to look for. Mystery solved.
And it prompted me to reconfigure my Roadtrek Wiring & Battery Replacement bringing everything under the bed & inside the Coach - saved about 80% of the wire runs as well.