Is there anything else in your rig that drains into the black tank, like maybe a washing machine? To eliminate the toilet, cut in a shutoff valve in the water line to the toilet. When you do drain the black tank, does it appear to drain a large quantity of waste that you would expect to see, from past experience?
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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