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Old 04-27-2015, 01:22 PM   #1
National RV Owners Club
Join Date: Oct 2013
Posts: 44
Black tank sensors

How do you access the black tank sensors on a 2005 6342 Dolphin? Mine shows full all the time and tried all the tricks on here.

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Old 04-27-2015, 01:46 PM   #2
Senior Member
Workhorse Chassis Owner
Join Date: Jun 2003
Location: Palisade CO
Posts: 3,588
I doubt if the sensors are the problem. The tank walls get crudded up with water bearing gunk and fool the sensors. Cleaning the tanks walls is difficult but usually fixes the problem temporarily.
I used a pressure washer with a homemade Tee on the end of the hose and washed the sides of my black tank using the toilet for access. That worked for a while but the walls would gunk up again after a while. I ended up just marking a calendar and dumping every ten days and quit worrying about it.

By the way I have a non-contact sensor system that reads through the tank wall.

Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
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Old 04-30-2015, 08:03 PM   #3
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National RV Owners Club
Join Date: Jun 2006
Location: Manhattan Beach, CA
Posts: 675
The black tank sensors are behind the black plastic cover in the curbside bay behind the rear tires.

try adding automatic dishwasher soap and half a tank of water and driving around. That's what cured our problems with false readings
Steve & Jeri
2004 Dolphin 5342
2000 Jeep Cherokee 4X4
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Old 09-09-2015, 11:42 AM   #4
National RV Owners Club
Join Date: Oct 2013
Posts: 44
JRV Products sent me a new circuit board for the monitor panel and every thing works great now. Tried the cleaning and that did not work.
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Old 09-09-2015, 05:53 PM   #5
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Join Date: Sep 2012
Location: Yakima, WA
Posts: 546
posting this only since I see you have same dolphin model I do...

I went to the Garnet See Level system. The monitor fits nicely right at the top of your control panel area, the wires that were already run for the goofy light level system work fine for the See Level system (capacitive system, no more bum readings).

Apply the new sensor strips to outside of the tank, transfer the wires from the goofy lights to the new control panel, and whoo hoo.

One of the best mods I have done and definitely the easiest (once you are comfy removing the pretty covers in the compartments).

I went with 709 series.
GySgt USMC (Ret) '79~'99
2005 National RV Dolphin Limited 5342
Workhorse W-22
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Old 09-09-2015, 07:25 PM   #6
National RV Owners Club
Join Date: Oct 2013
Posts: 44
The new circuit board was 95.00 to my door. Had not had a problem in 8 years. It was also plug and play and took 10 minutes to install. They told me how to diagnose the problem also.
I did think about the sea level if this way didn't work.

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