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Old 06-01-2014, 07:05 PM   #1
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Tank monitor issue

When we de-winterized the trailer, I couldn't see a level on the black and grey tanks while we were flushing until they hit 100%. I thought there might have been some stuff on them, so I didn't think much about it.. Last weekend there was 2 of us in the trailer and there wasn't a reading on the black or grey levels and this weekend there was 5 of us and they didn't move..
I took the unit off and took some voltage readings to ground before we drained the tanks (all with the "Level Check" button on):
- white w/ green - 3.15 vdc
- white - 0.00 vdc
- red - 5.56 vdc
- brown - 6.90 vdc
- grey - 7.45 vdc
- purple - 0.00 vdc
- black - 13.00 vdc (switch on or off)

I can't seem to find a wiring diagram and was hopin for some insight.. The panel is a black rectangular one about 4"x6" and has the black, grey, fresh and levels with 1/3, 2/3 and f lights. The battery lights are 10v, 11v and 12v.

The fresh water did move no lights to f and back down as we used and drained the tank. The battery light didn't move off 12 as we were plugged in all weekend...

Does anyone have any insight to what might be up?
Thanx!
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Old 06-01-2014, 07:10 PM   #2
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OK, first, voltage readings are not what you are looking for. The red resistor pack is pretty reliable, but you can measure each probe's resistance to make sure they are in spec.

These probes are almost always the cause of indication problems and not the pack or the display. Slime on the walls can provide a solid path to the ground probe (other side of the valve in the photo about the same level as the 1/3 probe).

Compare the OEM "button" to the upgraded Horst probe.
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File Type: pdf KIB Monitor Panel M21 Wireing Diagram.pdf (51.2 KB, 25 views)
File Type: pdf Micro Monitor Panel Troubleshooting.pdf (149.2 KB, 25 views)
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Old 06-02-2014, 01:29 PM   #3
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Thanx for the reply Herk.. As it is still under warranty, I'll let the dealer work on this one.. I called them this morning to discuss options and they figured it was a piece of paper or other debris that got hung up on a sensor..
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Old 06-02-2014, 01:50 PM   #4
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Quote:
Originally Posted by glen1971 View Post
Thanx for the reply Herk.. As it is still under warranty, I'll let the dealer work on this one.. I called them this morning to discuss options and they figured it was a piece of paper or other debris that got hung up on a sensor..
LIES; ALL LIES - GGGGRRRRR

1) NOT debris on the sensor
2) WON'T be covered under warranty because there is nothing wrong with the system
3) You WILL be charged at the "shop rate" of $150.00 per hour "troubleshooting" to let you know the sensors were dirty and they flushed the tank to clean them (100 - 200 bucks your cost depending on if they are slow or not).

They will make it sound like they are "giving you a deal" because you are a customer or because the moon is in the 7th house or some other such BS.

One of the reasons I love this forum and hate dealer back shops.
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Old 06-02-2014, 10:58 PM   #5
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I didn't think the "debris on the sensor" made sense.. Kinda goes against the conductivity principle of the sensors...
I found a dealer alot closer and he seemed to figure it may be a loose ground connection at one or more of the tank connections..
I'm gonna take it in the week after Father's Day.. I'll post an update once I get it back..
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Old 06-03-2014, 09:28 AM   #6
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Quote:
Originally Posted by glen1971 View Post
I didn't think the "debris on the sensor" made sense.. Kinda goes against the conductivity principle of the sensors...
I found a dealer alot closer and he seemed to figure it may be a loose ground connection at one or more of the tank connections..
I'm gonna take it in the week after Father's Day.. I'll post an update once I get it back..
Here is the troubleshooting guide. A "loose" ground will not cause what you are seeing. They just want to justify the troubleshooting charge.
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File Type: pdf Micro Monitor Panel Troubleshooting.pdf (149.2 KB, 39 views)
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Old 06-03-2014, 09:59 AM   #7
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Originally Posted by Herk7769 View Post
Here is the troubleshooting guide. A "loose" ground will not cause what you are seeing. They just want to justify the troubleshooting charge.
I know, when Jupiter aligns with Mars, that will solve the problem. Seriously, before you take it to the dealer, look up how to clean your black tank. Listen to the advise here, it will save you big bucks.
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Old 06-08-2014, 08:32 PM   #8
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Thanx for the replies.. I did some more investigating into this one today... After emptying the tanks I pulled the trailer up on the sidewalk at home, so it was pretty level and brought out my older black tank "flusher" (white wand with the jets at the bottom).. I used that with as many tuns as I could do around the tank, then filled the rest of the tank with water from the hose.. We took it as high as I dared and saw the levels go up to 1/3 and 2/3. It was up to the bottom of the toilet (black joint to the toilet).. I drove it around and drained the tanks.. I should have looked at the levels, but am going to assume that it must have gotten cleaned off..
I filled the grey tank via the bathroom sink and saw it go up to 1/3, 2/3 then full.. It took awhile to get to 1/3 and then was very quick to 2/3 and full.. I am guessing at maybe there was some soap build up on that sensor?? But it seems to be working...

Is there a cleaner that can be done into the tanks to help get rid of any build up? I've heard of ice in the black tank and the Calgon trick.. What about the grey tank? Is there any additives that are decent for removing sludge?

I think I'll be calling the service booking I had and cancelling it on Monday...

Herk - I like the upgraded sensors and will be looking at something like that should these fail after the warranty expires...
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Old 06-08-2014, 10:45 PM   #9
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I use RV-Digest-It from Unique.

I swear by it. Dump 1/2 a bottle in the toilet and fill to the top with warm water. Let sit 72 hours minimum and then dump and flush.

You will NOT believe what comes out!

RV Digest-It Holding Tank Treatment

Buy a couple of bottles. You will use a full quart every winter (1/2 in each tank; fill then soak; dump and rinse during winterizing).

Tanks have NEVER smelled and always flush clean. Between RV-Digest-It every winter; capful Calgon Softener and capful detergent every dump; and Horst probe upgrade; our monitor works perfectly.
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