The wall plates may be ok, but wired wrong so shorted. If you wired the new ones the same way, they would also be shorted.
There should also be a 10a fuse in the DC fuse panel that is for that panel that fuses both the 12v socket in it and the 12v power that goes up the coax to the antenna amplifier in the batwing.
If the panel is wired wrong that might also blow that fuse.
Installers can make mistakes. A trailer we had new had the coaxes on the wrong studs on the splitter in back of the panel. The coax running to the bedroom had 12v on it, and the one going up to the batwing had no power. Took me a while to discover what was wrong. :(
