It is odd to me that the company puts conflicting numbers on the converter. Maybe the keyword is "max". I'm reading that as it can be up to 30amps but as wired only 20 amp fuses should be used?...hmm
P.s.
When you get the battery wired correctly, take a picture. Then you'll always have it handy just in case.
That silver box silver box attached to the positive terminal is an automatic resetting circuit breaker so to speak. It may be bad. Use a multimeter to see if current is flowing thru it.
Selling my Flagstaff 625D popup to fund the sales tax on a motorhome.
It is in great shape and everything works as intended. Electric lift, slide out. A/C, water heater, propane heater, inside potty and shower, new tires this year (60 miles on them), king and queen bed as well as the couch and...
Many have had success with Rustoleum boat paint. Google "roll and tip".
I've built and restored several boats with this method and the results are pretty amazing.
I had an inline fuse coming off the battery to the converter. There was a fuse holder that was pretty hidden before it went into the box. Follow your positive wire and make sure there isnt a hidden fuse.
OP, your popup looks to be in great shape for its age. I remember a person made a leverage bar for his A-liner. I'll see if I can find the video. Maybe fabricating a similar leverage bar would help. BRB