A converter charger in a recreational vehicle (RV) is powered by 120-volt alternating current when the RV is hooked-up to shore power, or when a properly connected generator is running. The primary purpose of the converter charger is to recharge a discharged or partially discharged coach battery or bank of batteries, so that a full supply of 12-volt electricity is again available. It does this by converting 120-volt alternating current (AC) electricity to 12-volt direct current (DC) electricity. To test the function of an RV charger converter is a relatively complex procedure, and the test must be performed in sequence.
Use your voltage meter to test across the 120 volt AC terminals to determine whether or not power is being sent to the converter charger. Plug the RV into shore power or a running generator.