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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 08-18-2008
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Default Holding Tank Gauges

Both my grey water and black water holding tank gauges have quit registering. Both simply show 1 'dot' on the panel, but I know that's not at all accurate.

(The pure water tank seems to read correctly.)

Access to the tanks on my '95 is really poor (they're completely enclosed in the basement and requires some disassembly to get at 'em.

My first thought (fear?) was that I'd sprung a leak, but there was no sign of it under the coach or in the basement. Upon dumping the tanks, it was obvious that both had plenty of content.

I'm guessing that it isn't a blown fuse, since the display panel still lights up, etc. I'm wondering if there's a broken/corroded connection -- and, if so, where it might be.

Any ideas?

Thanks

On the road in Idaho Springs, CO

Any ideas?
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  #2  
Old 08-18-2008
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Default

Just a thought Pete but I'm wondering why both tanks are not registering. They have separate sensors and each sends it's signal to the panel. It's only at the panel that the signals are interpreted and displayed. I'm thinking it is unlikely that both sensor systems failed and more likely that the problem exists with the panel. The panel is the common denominator. Just my thoughts.
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  #3  
Old 08-18-2008
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Now that's an interesting thought. It could be the panel rather than the sensors -- as you say, a double failure seems unlikely. Now, I have to figure out how to trouble shoot the display panel.... <sigh>...
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  #4  
Old 08-18-2008
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before you start on the panel,run a test on the tank sensors.
the way they work is theres a ground wire that runs to a probe on the side of the tank,near the bottom.
next to that probe is another probe that will indicate empty on the panel,then above that probe will be a series of probes,all the way to the top of the tank.
the way i understand it is the water makes a connection between the probes and makes the light on the panel come on,so,why not run a test wire from ground probe to the other probes to see if the lights come on,on the panel.
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  #5  
Old 08-19-2008
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Pete, I suspect your 95 is pretty similar in layout (the basement) as my 97.

The tank probes are VERY easy to get to on mine. You should have one dummy bay door (the 3rd door, rear, on passenger side). If you open that door, there is a sheet metal panel held in place with 6-8 screws. Remove those screws, take out the panel and there are the tanks and probes.
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  #6  
Old 08-19-2008
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Pete,
As Paul indicated, my 96 has the same access panel in the rear passenger bay. Hopefully your 95 will be the same.
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  #7  
Old 08-19-2008
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Default I'd be careful with those probes.

I'd be careful shorting out those probes... DC doesn't conduct too well so I believe they have circuitry that converts DC to an AC frequency to conduct between the probes? I don' know the frequency or voltage, but that design would make sense.. So, Be Careful!
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Old 08-19-2008
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and thats a good idea!
so,how would you check it? they use water instead of a wire to conduct the electricity,what would you use?
curious george.
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  #9  
Old 08-19-2008
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Well, to be safe I'd use a volt meter set on A/C and on a highest scale. Then measure between the ground wire and the other wires. If you get no reading then move down the A/C volt scale until you do. My guess is you'll get a high reading on probes not wet and a low reading (maybe near zero) on the ones that are wet. Of course, this is what I'd expect on a working system.
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Old 08-19-2008
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Default After thoughts...

Ok.. just in case I'm wrong and you see no readings at all, simply switch the meter to DC and repeat that procedure. Also, I'm wondering if someone will have to hold the monitor button too? I know when I get my wife to help on a project and she has to hold something and listen to me while I'm under the bus.... hmmmm COMMUNICATIONS! Use walky talkies.. hee hee hee
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