Is it possible you replaced the battery with a deep cycle marine battery with CCA, cold cranking amps, listed on the top of the battery?
If so, those are more for boats, not RVs. They are used to start boat motors, have a big burst of power but not long lasting, they'll run a few lights & possibly a small trolling motor, but not big constant draws like your slides.
You need a deep cycle with only amp hours, aH, listed & the more the better.
Just a thought.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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