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Cheap skate here too. The dealer provided 12v deep cycle battery that came with our new coach was evidently abused like a red-headed step child. Most are.
I modified my class C step to accommodate two GC2 6volt flooded batteries $89 each from Sam's Club.
Simple fix...
As suggested above, get a battery hydrometer. Test the cells in your current battery... forget the load test. If ANY cell is bad, the battery is toast.
Step two: Replace the battery with what you feel comfortable $$$.
Step three: Invest in a minimal solar setup to prevent a repeat of this scenario.
If you use ANY lead-acid battery, you MUST keep up on the charge cycle. Discharged below 12volts even a few times will RUIN a deep cycle battery. You can get a 170watt Rich Solar panel for $180. I consider that - even with a cheap PWM controller - a wise investment for battery maintenance.
You'll notice many motorhomes now come with at least one panel on the roof. That's all you need... unless you heavily boon-dock.
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