Also, be careful about using any heavy load (like slide motors, tongue jack, etc.) without a good, fully-charged battery in place. The converter may not be able to handle the load on it's own, and could get damaged.
When plugged into shore power, what voltage do you read (using a multimeter) at the battery cables? It should read 13.4 (or so) volts DC. If not, then you're not getting any charge current from the converter.
Keep in mind that fully-discharging a battery (whether intentional or not) is not good for the battery. It will reduce it's life greatly depending on the specific type of battery. If it turns out that your new battery is in fact fully discharged, it may be ruined - or at least have a much shorter life.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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