When plugged in to shore power with my battery switch on so they (2) are in the circuit the voltage across my batteries is low, 11.5 volts. If I read the voltage from my converter with the batteries disconnected, it is 13.6 volts. I've had the batteries checked with a load gauge and was told they are OK. Does a converter ever put out a voltage like the 13.6 I have and not provide the current required to charge the batteries when they are connected to the converter? Or should I have my batteries rechecked by someone else?