Wrapping it up. I sent an email to the manufacturers of my converter and this was their reply.
Disconnect the batteries, and turn off as much 12 volt load as possible. Monitor the voltage at the blue wire and DC negative (battery negative). The voltage at no load really should be close to 13.8VDC measured with a good quality voltmeter. Turn on 12 volt light bulbs one at the time. See how many bulbs will illuminate until the voltage drops below 12.5volts. Each incandescent lamp (bulb) will draw about 1.5 amperes. Total that amp load. If the voltage drops below 12.5 with significantly less than a total of 55 ampere load, the converter section would be considered defective and would require replacement.
Unfortunately, without a DC ammeter capable of reading 55-60 DC amperes to use in conjunction with the voltmeter, you cannot know with absolute certainty the converter is defective. However the test above works very well most of the time.
When I did this my reading were very erratic. In the 22 then 9 but mostly around 9. So I determined the converter was bad and decided to call Randy at Bestconverter and get me a Progressive Dynamic 4600 series. It came yesterday and I had it installed with a couple hours of it arriving at my doorstep. I may do one more post in a week or so saying how it has performed for me. The install was not bad at all. I am looking forward to having my batteries charge quicker and not worry about overcharging.