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Old 04-15-2018, 08:03 PM   #1
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Black water tank.

Black water tank always reads empty. Any suggestions on how to fix.
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Old 04-15-2018, 08:15 PM   #2
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My guesses:
1. lead on the "ground" sensor is not connected at the tank or
2. something's not connected in the level indicator panel.

How much would you guess is in the black tank?
Do other tank levels read what you believe to be correct readings?
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Old 04-15-2018, 08:50 PM   #3
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Thanks for your reply Mr Dan.
The black water tank is the only one that doesn't register anything. Funny, my galley water tank never reads empty even after flushing. I did open up the panel and all the wires seem to be intact.
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Old 04-15-2018, 08:53 PM   #4
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Thanks for your reply Mr Dan.
The black water tank is the only one that doesn't register anything. Funny, my galley water tank never reads empty even after flushing. I did open up the panel and all the wires seem to be intact.
The level sensors are notoriously crappy (no pun intended) and not to be trusted.

If you don't find something obvious and it's a new unit under warranty, take it back to the dealer.
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Old 04-15-2018, 09:03 PM   #5
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Just out of warranty.
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Old 04-15-2018, 09:09 PM   #6
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Black water tank.

You may have to pull down the belly cover (assuming you have one) and check the wire to the lowest sensor on the black tank. I'll edit from another device to post a pic (if I can find it).
I had removed a middle wire in this pic (galley tank but it works the same).
Click image for larger version

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Hereís why my galley tank registered NOT empty when it was.
Click image for larger version

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Old 04-15-2018, 09:38 PM   #7
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Thanks Dan. Yes I have a belly cover. I will have to pull it down. Thank you for pointing me in the right direction, and for the pics. Very helpful.
Is there a trick to pop those sensors out?
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Old 04-15-2018, 09:45 PM   #8
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Yes, the stud is double-nutted with the wire's ring terminal in between. You remove one nut, remove the wire (remember which color goes where), loosen the remaining nut, put a set of side cutters behind that loose nut and pull out the sensor ------------------ ONLY if the tank is empty beforehand AND the sensors look like mine... else - punt.

There's a better description somewhere. You might search for 'sensor'.


EDIT: rockfordroo is correct. This design IS pretty weak.
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Old 04-15-2018, 09:52 PM   #9
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Some toilets have a straight drain pipe down into the black tank. If so you can open the toilet flush valve and use a flashlight to verify how empty/full the black tank is. Good luck.
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Old 04-15-2018, 10:41 PM   #10
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Originally Posted by Mr. Dan View Post
Yes, the stud is double-nutted with the wire's ring terminal in between. You remove one nut, remove the wire (remember which color goes where), loosen the remaining nut, put a set of side cutters behind that loose nut and pull out the sensor ------------------ ONLY if the tank is empty beforehand AND the sensors look like mine... else - punt.

There's a better description somewhere. You might search for 'sensor'.


EDIT: rockfordroo is correct. This design IS pretty weak.
Thanks for all your help Dan!!!
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Old 04-15-2018, 10:43 PM   #11
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Some toilets have a straight drain pipe down into the black tank. If so you can open the toilet flush valve and use a flashlight to verify how empty/full the black tank is. Good luck.
Thanks. I can an have done that. Its a newer Trailer and I just like things to work.
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Old 04-15-2018, 11:03 PM   #12
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Thanks. I can an have done that. Its a newer Trailer and I just like things to work.
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