Sam Spade wrote:
Before you do anything, you have to be sure the batteries and connections are good.
I TOLD you to be SURE the battery itself and the main connections were good BEFORE you spent money on a converter....well, a better converter wasn't money wasted but.........
Your battery is NOT connected to the rest of your system or it has a bad internal connection.
This could be because of a bad connection at a clamp, a bad solenoid or simply a battery disconnect switch in the OFF position.
If the converter was charging it, it would measure MORE than 12.6 and it would run the lights when the shore power was disconnected.