Troubleshooting Valterra Horst Black Water Tank Sensors Read Empty All the Time

Published 10/05/2018

Question:

I installed these on my 08 camper and all I get is a red empty light when I try it and when we use the bathroom I try to see how full my tank was and the empty light comes on the only thing I did not move the lower senor eight inches away from the other sensors could this be the problem. thats Don

asked by: Donald G

Expert Reply:

Most likely a ground wire issue. There is one common ground wire between all tank sensor packs and frame.
Quick test is to jumper between the bottom sensor and good ground, should read empty if tank is empty. Then you can jumper from the bottom sensor to the one above it for 1/3 and the one above that for 2/3 and the top one for full.

If that works then check for the common ground wire. We have added ground wires in addition to the original one.

expert reply by: Jameson C