If you are referring to the 12 volt accessory plug, like the one you may have in your Winegard antenna booster, it is probably rated for a MAXIMUM of 7.5 amps 12 volts DC.
12 volt DC amps and 120 volt AC amps are different animals.
Here is the Winegard spec sheet and warning:
WARNING: Do Not Connect High Current Devices to +12 Volt Receptacle
on Wall Plate/Power Supply.
Maximum current ratings of
this receptacle is 7.5 amps at
If there are other 12 volt accessory plugs in your RV (not in the Winegard antenna booster plate), they may be a little higher rated, as Youroo showed. You may have a fuse in your control panel that controls it/them.....and that will be your max 12 volt DC amps for it/them.