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Old 08-01-2017, 12:02 PM   #1
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Keystone Lardeo

I just purchased a new camper trailer. I've owned two motor homes but this is my first camper trailer. Everything is great but I have on small problem. The black tank indicator never shows 2/3 full or Full but it does indicate when it's 1/3 full. The gray tank for the Island kitchen works well but I've never filled the bathroom gray tank so I'm not sure if that one works either.

So I pulled the panel off the wall and found that there's one small green wire leading to the indicator which is not connected to anything. It's the one right smack in the middle of the LED display circuit board. All the other wires are connected to the wire bundle coming through the wall from the tanks below so there's no loose wire that I can connect the green wire to.

I full time and would hate to haul this thing all the way back to the dealer for one small wire. If I knew where to attach it to I could do that myself and save my self a lot of trouble. Would anyone know where I could get a schematic of the tank sensors to the led display? Or has anyone else had this problem and found the solution?

I was going to post photos but I have no idea what the URL of my images are since they're on my hard drive.
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Old 08-01-2017, 12:41 PM   #2
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Don't know about the wiring but for posting photos see:
Posting Photos on the Forum

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Old 08-01-2017, 04:37 PM   #3
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What model Laredo do you have? I am tempted to pull mine off the wall and check on the Green Wire. The Green wire may be a spare and not intended to be hooked up. If there is a name on the indicator panel, google it. Also in the enclosed paper work they may have included the instruction sheet for the level indicator.
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Old 08-01-2017, 07:20 PM   #4
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Welcome to the forum from Kansas City, MO! Glad you're here! Someone will be able help out I'm sure. I can't believe Keystone would just give away a free wire. It must attach to something.

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Old 08-01-2017, 08:19 PM   #5
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Keystone Lardeo

Depending on how many tanks you have and how many indicators you have on the panel, there may be a wire that is not used.

As an example: let's say your panel "shows":

1 fresh water tank

2 gray water tanks

2 black tanks

And your unit has:

1 fresh tank

2 gray tanks

1 black tank.

In the above example the monitor panel will have 7 wires and only 6 will be used. If any tank only reads 1/3 full, the issue is more than likely either the wires fell off or are loose AT THE TANK! Or the sensor pack AT THE TANK has failed. Have you filled the black tank to the point it is coming up the pipe at the toilet?

I would disregard the green wire for now, the coroplast needs to come down and the tank accessed. If you can do that, make sure which tank is which by following the drains back. As a rule black tanks have a 3" outlet and grays have a 1 1/2" or 2" outlet, but I have seen 3" on grays.

Once you have access to the black tank, locate the side with the sensors and wires attached. The bottom one is ground. Try jumping from that sensor to the frame, if that fixes it just put another ground on. If not then start jumering from that sensor to the other ones going up the tank. If jumpering doesn't indicate, then the sensor pack is probably bad. If it does then the sensors in the tank are probably bad. Either way is an easy fix.

If this is something you want to attempt, I'll be more than happy to give you further instructions.

Just some added info: if the sensor packs and monitor panel are KIB, the jumper test won't work on the FRESH tank. You have to use a resistor ( can't remember how many ohms) in the jumper as they have changed the boards to accommodate minerals in the fresh water.

Are you confused now?

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Old 08-02-2017, 08:00 PM   #6
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Had the exact same issue on our 2017 premier. Turned out to be a broken wire way down by the black tank. Pretty involved repair done under warranty. Works great now. All of the other sensors read fine.

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Old 08-19-2017, 06:51 AM   #7
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Thanks. That's a lot of good information. I asked the Guys at Dixie RV to check other Travel Trailers and they confirmed that the green wire is not used.
After a few more weeks of use the Black tank indicator lights began working. So everything is good now.
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