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I don’t think very many new RV owners realize that just because you are plugged into AC shore power does not mean that your coach batteries are charging from the converter. The use/store or specific coach and chassis battery disconnect switches (typically located by the door) must be “on” to allow battery charging and high load coach operation. What fools many users is that the coach 12volt basic systems (like the lights) work when on shore power (via the converter), or the coach battery disconnect switch by the door may be lit.....so they assume the batteries are charging.......NOT. The best low cost investment any RV owner can make IMO is a basic multimeter (volts, ohms, amps – although amps range on many cheap multimeters is not practical for the load currents the RV uses). Learn how to use the meter safely (DC or AC volts select; correct voltage range selected; never ohm check on powered wiring etc). If you are wondering if your batteries are charging measure the DC voltage across the battery terminals when they are lightly loaded. If the reading is 13.1 approx or higher they are charging. Some batteries are hard to physically reach for measurement, but sometimes other systems (like some inverters) may include remote panels that show chassis battery voltage.
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