Yep.....disconnect the cable from the positive post on the battery. If you still have your lighting and water pump, you're using the shore power.
A less intrusive way might be to check battery voltage with shore unplugged, then also plugged in. If there's 13.8-14.5 volts with shore connected, you're on the converter supply.
Oh, sorry. You'd need a volt-ohm meter, and "sample" the voltage at the battery terminals, by touching the positive lead to positive terminal, and negative lead to negative terminal, with the meter set to dc volts.
If you're not familiar with these procedures, you might want to get somone who is to do it for you.
Or better yet, teach you to do it for yourself.
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