Since the awning operates on 12 volts DC, the circuitry to the awning is exactly the same whether the trailer is connected to shore power or disconnected from shore power. So your awning works on shore power, but not battery power alone. Likely that means that there is some lack of power coming from your battery. It could be a bad connection or a badly undercharged battery.
Originally Posted by krattie
Battery works fine for the electric jack.
So it seems like the battery is fine. Maybe the battery has since discharged? Maybe there is a poor - but not broken - connection in the switches and wiring to the awning, so that it will work when connected to shore power (and maybe 13+ volts) but not on battery power (and maybe 12 volts).
I'd suggest starting with checking the state of charge of the battery, and then checking the wiring, switch, and connections to the awning motor.
Others will likely post other ideas. Stay tuned, and good luck.
By the way, when your power jack worked properly when not connected to shore power, was your trailer still connected to the tow vehicle? Since there is a charge wire connected to your tow vehicle battery when the umbilical is plugged in, it could be that your tow vehicle battery operated the jack, and not the battery in your trailer.
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch