My black water tank was showing 2/3's full when empty, I tried several different things, made sure I use the built in tank flusher, etc. Finally went and bought one the wands you put down the toilet, cleaned it for about 10 minutes this morning, got the reading down to 1/3 full...But this is our fourth RV and sooner or later the black water sensors always seem to go bad. No a hard job to replace if you can get to the tank....
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Joe
2015 Chevy 2500HD 4x4,2008 Crossroads Cruiser M29CK, 2008 HD Ultra Classic Trike
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