Hello,
you should have a 12v switch located very close to the tank level Indicators. It should possibly be another in your bathroom to work as an alternate location to activate the pump also. Just two places to look and they will work like 3way light switch. This should help.
Good luck!!
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2005 41'4 ATRIUM 8410SE CAT
2017 20' Diamond closed trailer
2014 Streetglide Special
2010 Mini Cooper or 04 H2