The 12v plug-in on the helm started working sporadically. As I jiggled it
to work it , I noted that the am/fm/cd player started working sporadically
as well. (it's located in the cabin). However, when I jiggled the 12v plug
(while holding my jaw correctly), both work. Why would the be related? Do
I have a grounding problem? Also, I noticed the current to the ac adaptor
was insufficient to charge my laptop, whereas prior, it was more than
sufficient.

Boats!

And yes....I know next to nothing about electrical systems.

-Greg