[hiccup]

OK, that's a start. So you have 13.5v at the C-Charger but it isn't making it to the batteries.

Again, the most likely reason for this would be at the DC (not AC!) distribution panel--the breaker labeled "Engine Charger"--make sure it is on! Keep in mind there is an AC breaker for the battery charger (that's AC power to the charger) but there is also a DC breaker for the power from the charger. Both have to be on.

And the red wire from the charger isn't going to go directly to the battery. It will go from the charger to the aforementioned breaker and then likely to a distribution bus bar located near the back of the battery switches. It is here that the power from the charger would be attached to the main battery cable going to the engine battery bank.

So, next step is to check the breaker. If that is on I would get in the engine room and take off the back panel of the electrical distribution box. Note that this will expose live 120v connections so if you're not comfortable around high voltage then disconnect your shorepower first (although this makes troubleshooting more difficult).

Once that cover is off you should be able to probe the connections with a multimeter to determine where the disconnect is between the charger and the battery bank.

Hope this helps.