Montana has a history of plumbing the washer to the black tank. I remember some in 2008 and 2010. You would think they had learned their lesson. But apparently not.
Chase the plumbing to see where the washer line enters the black tank plumbing. You might be able to re-direct it to another tank (best option) or to a new drain output connection (2nd choice).
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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