Thanks, all!
> CHECK YOUR INCOMING VOLTAGE
Thanks. Just checked YouTube and looks like using the multimeter on the socket's fine. I'll check it in the morning and report back.
> Who installed the Magnum?
It's stock, installed by Coachmen (Cross Country, Sportscoach, whatever). Had it 6 years, never had any issues with it.
> The inverter has a transfer switch (a relay, basically) that normally will pass through the shore power when it is on to the connected circuits,
Ah, that makes sense, and now seems obvious, but I hadn't thought about that. Thanks. I'll see if I can monitor the voltage on that in the morning.
