Answer

Hi, this is Michael, as a rule it is not a good idea to remove the batteries. The reason for this is that it helps to filter out the a/c sine wave being converted into dc. Its not a perfect situation, so the batteries flatten out the line. If the converter is showing a charge voltage, 13.8, next question is what is the voltage at the light fixture, this will tell the story.......The thinking here is when the converter is at 'idle' it may appear to be normal, yet when it is under a load it faulters. Also are two sides to the fuse panel from the converter, one is straight up converted voltage, the other is filtered for use with electronics ex: radio, lpg leak detector ect.................Do the test, and get back to me........Are the batteries over or near 5 yrs old??????????