Certainly sounds like a discharged battery...
The battery is provided by the dealership and does not come with the new trailer. We had to pay extra for our battery...
Batteries are so important and we learned early on to always check on them when on shore power or not...
It hehoves one to get a mulitmeter. We measure across the battery terminals all the time checking them. When the battery is fully charged it will read 12.6-7VDC and when you first plug into Shore Power I always read across the terminals again and it should read 13.6VDC or whatever mode you smart mode converter/charger is in.
If it doesn't jump up to the higher DC VOLTAGE then the trailer is not charging your battery. I like to check this when first plugging in to make sure I haven't left my battery disconnect in the DISCONNECT position..
It is also necessary to have a working battery when you tow your trailer on a public roadway as the on-board battery serves as a 12VDC Power Source in the event the trailer becomes disconnected from your truck and is used to operate all of your trailer electric brakes which is activated when the break-away switch has be pulled. This is actually a DOT law to have a working battery if you are pulling down PUBLIC roads... Could affect your trailer insurance claim if known it did not have a battery connected.
There are fuses and a possible auto or manual reset relay in the wiring between the 12VDC Power Panel and the battery terminals. Two of those fuses are called REVERSE POLARITY that blows when you hook up the battery cables backwards...
You will need to start tracking down where the 12VDC coming from your on-board converter/charger stops when you have it turned on.
Need to learn all of these things before heading out... All of this should have all been discussed in your Pre Delivery Inspection (PDI) when you picked up your new trailer...
Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS
"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"