Assuming you meant 14.6 volts and not 14.6 amps. When you tested the cables were you still on shore power? Assuming the test at the converter and the test at the cables were in the same testing session I would look for a blown fuse or re-settable circuit breaker (often mounted under the tongue) that is stopping the current to the cables.
Alternatively measure the voltage at the batteries when not hooked up the the RV. Write that number down as Battery Voltage. Then attach the battery to the cables and connect the shore power cord. Now measure the voltage at the batteries. Do you get Battery voltage or do you get a larger voltage signifying the charge current is getting to the batteries.
If you have solar you might want to cover the panels for these tests.