No trailer power when connected to the truck hitch. Why?

How come your trailer battery don't work... That is what i use for all of my trailer mounted 12VDC items.

What may have happened is the battery was run down by the service people when they was working on things. The trailer battery won't last very long not being plugged into shore power. ALot of what they call parasitic drains inside the trailer.

I use a battery disconnect switch on mine so I can quickly disconnect the trailer from the batteries.

Roy Ken