Just to throw my two cents in ...
Yes, do check the campground pedestal's ground, if it's open or connected to neutral, it could be the problem.
However - and more scary - disconnect your shore line from both the pedestal and the Alpine. Now carefully remove the connection from the yellow cover and check the wiring connections. You may have a loose ground wire in the plug for the Alpine! I did a post some time back in Repairs about what I found under that yellow cover - gave me nightmares!
But be sure you understand what you are doing with the cable before you start!
Ron
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2011 Alpine 3640RL (Beauty)
(Gone! Now replaced by Beauty3)
2016 Ford F-450 (The Beast)
Diesel 4x4, DRW, LB, CC
Comfort Ride Hitch
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