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Black Water Level indications

Yahoo Message Number: 81478
On my 2003 Magna all water levels work normal accept the black water. The black water reads full all the time. I have cleaned the tank and also replaced the 3/4 full sensor. This problem started last year when it would show 1/2 full all the time, then over time went to 3/4 full and now full all the time. Question is there a circuit board some place that I could change? Does one circuit board run all water indications or is there one for each water level? Thanks, Wayne Lenox 2003 Magna #6255

Re: Black Water Level indications

Reply #1 –
Yahoo Message Number: 81508
On my old rig, the same indicator level light works for all tanks.

There is also only one wire from each tank.
So the circuit board appears to receive a signal from the tank and interprets what the level of content is and triggers the appropriate level light.
If your black tank indicates always full, you likely need to troubleshoot the board or the sensor.

Dean

95 Magna 5280

There are dedicated wires for each tank and each level

Re: Black Water Level indications

Reply #2 –
Yahoo Message Number: 81512
It's one board. Mine does the exact same thing for the last few years. If I could, I would stick a pressure washer down the toilet and hit the sensors before messing with the board. Or hire one of those companies that does RV tank cleaning. I have no pressure washer and there is not one of those companies near me. I would be most interested in what you do to resolve this problem.

Rich 2002 Magna

Re: Black Water Level indications

Reply #3 –
Yahoo Message Number: 81519
Wayne, I forgot to mention.

The printed circuit boards in my overhead dash are not production type boards. You may be able to find some in a junk yard or a surplus rv store. Or somebody in Junction City might know where to get a new one made.
I had a problem with my Automatic Water Fill PCB. The good folks on RV.net helped me test and trouble shoot the components of the board and get it working again.
Hopefully your problem is a dirty sensor, but it would seem you have eliminated that cause.

Dean

95 Magna 5280
 

Re: Black Water Level indications

Reply #4 –
Yahoo Message Number: 81521
Someone told me to put crushed ice in the tank and dry a few miles to clean the sensors.
Roger

2002 Affinity 6125