Well don't worry about the black tank sensors too much, nice when they are working, but it seems that as we use our rig, the grey tank fills before the black, and we use that as a gauge.
I have in the past got it to work for a short time, didn't drain the black after a trip, but added 1/4 box of Rid-X, and lest set for a month, then drained and flushed once and sensors worked fine once!
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Russ & Paula and Belle the Beagle.
2016 Ram Laramie 3500 DRW 14,000# GVWR (New TV)
2005 Copper Canyon 293 FWSLS 32’ GVWR 12,360
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