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BOTH batteries need to be getting a charge from the converter to stay charged. Fix that and you should be fine. These batteries would need to be connected in parallel. Positive of one to the positive of the other and the same with the negative leads OR have charging leads come off the converter to BOTH batteries. Hope that clears that up for you. Please get back to me later if you need more as all follow ups are included in our fee.
I read your question and fully understand what it says. I can tell you that it is NOT being charged up separately from the generator. That set does not put out 12 VDC for charging. If you would like another opinion on that let me know.
There may be an aftermarket product that does this for some applications, but I have not heard of any used in RV situations. It would be easy enough to add one if you have a 120 VAC outlet close to the genset or add one. That might be more practical than adding charge lines depending on the distance between batteries. A trickle charger would work or even a small solar panel.
I was referring to the regulator you mentioned...........not the manual. I do know this set an know it won't charge a battery. No problem on the refund. Just take it into a shop and have them fix this for you.