The slides need a fully-charged, functional battery. If you're connected to shore power, the voltage you're reading at the battery is the charge voltage, not the battery.
You should consider load-testing the batteries to make sure they are in good shape (even if new - new batteries can be bad too).
If the battery checks out good, I would then look into all the battery power/ground connections to make sure they are clean and tight (remove all corrosion/rust).
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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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