I have a 2008 Sundance 2800 RLS and the batteries will not charge. I have already put new batteries in it and I have it plugged into 30 am shore power. It worked fine for the first 39 days after I put the batteries in, but now are completely dead. Any suggestions?
Start by checking the circuit breaker is not tripped. Then on the converter, there may be some fuses, check to see if one of these is blown, being a 2008, the converter or charger, may or may not have fuses.
Using a multimeter, if everything there is good, you need to test and see if there is 110VAC coming into the converter. Then if everything is good you will need to check the converter is putting out 12VDC. Disconnect the batteries and with a multimeter check to see if you have at least 12VDC across the leads coming from the converter.
Jumping to the end, if you have power coming in, no power out, it may be time for a new converter, just an assumption without knowing any of the above test results.