Holding tank 2/3rd full -- meaning of?

I have a recently purchased 1999 3023, which I have not yet used. The previous owner had filled the system with antifreeze, which I have purged. As part of the antifreeze purge, I added bleach to the fresh water tank to sanitize the system. I also hooked up to the city water connection to see if there were any leaks and to help flush out any residual antifreeze and to purge air from the lines. After disconnecting from the city water connection, I checked the status board (under the sink) which shows fresh water level of 1/3 which is probably the amount I added together with bleach, but holding tank 2/3 full. Why would the holding tank be showing 2/3 full?

You probably ran water from the faucets in the trailer to purge the antifreez, that water went into your "gray"water holding tank.
Drain the gray water holding tank and see if the status board shows empty.
There may also be debris on the sensors in the gray water holding tank which could cause a false reading.
Filling the gray waer holding tank with water and bleach, let it soak, then drain may solve that problem.

An old trick for cleaning gray and black water tanks in RVs is to put in Dawn blue dish detergent and a few gallons of water prior to your next trip. Let them slosh around and then drain everything when you first arrive at your campground. It will often remove residues that can cause false tank readings.

Originally Posted by MisterP

An old trick for cleaning gray and black water tanks in RVs is to put in Dawn blue dish detergent and a few gallons of water prior to your next trip. Let them slosh around and then drain everything when you first arrive at your campground. It will often remove residues that can cause false tank readings.

Any particular reason for the Blue?

Would someone please take a look at the attached photo and tell me if my interpretation is correct?
I interpret this as indicating that the fresh water tank is somewhere between 2/3rd and 1/3 full, the "holding tank" (gray water, I assume) is 2/3rd full, and the battery is fully charged. I don't quite understand why ALL the lights for battery status are lit.
Also: what is the "refer fan"?

[ThePair]

Refer fan = Refrigerator Fan. This is turned on when using DC power for the Fridge with the shells closed. The fan will keep air circulating for the fridge heating/cooling element by drawing in fresh air, and then blowing it out, through holes in the bottom of the TM.

The battery lights are lit probably because you're plugged into shore power? My interpretation of the letters are "C"harging, "G"ood, "F"air, and "L"ow.

I think you have properly interpreted the lights for the holding and fresh water tanks.

Originally Posted by EAKlebe

Any particular reason for the Blue?

Blue is a better grease cutter but any will work as long as it is Dawn which works well on oils and grease.

The C on the battery meter is charged, not charging. There is no light showing the battery is charging other than this meter moving from a lower to higher status.

[Bill]

Originally Posted by MisterP

The C on the battery meter is charged, not charging. There is no light showing the battery is charging other than this meter moving from a lower to higher status.

Hmmm, not sure I agree. The series of lights is basically a four-step voltmeter. It is my experience that by itself, a fully charged battery will show 3 of the 4 lights. But the charger puts out a higher voltage - that's the only way it can force current into the battery - and the fourth light indicates this higher voltage. It doesn't tell you anything about how big the charge current is, but it does say that the charger is connected.

According to the manufacturer, the trip point for the fourth light is supposed to be 12.7 volts (lowered from earlier versions). Some sources say that a freshly-charged battery can rest at 12.7 volts, especially if the surface charge has not been removed, so I suppose that the light could light without the charger being on. I have never seen it do it, though, so I guess that's the source of my skepticism.

Bill

Originally Posted by Bill

Hmmm, not sure I agree. The series of lights is basically a four-step voltmeter. It is my experience that by itself, a fully charged battery will show 3 of the 4 lights. But the charger puts out a higher voltage - that's the only way it can force current into the battery - and the fourth light indicates this higher voltage. It doesn't tell you anything about how big the charge current is, but it does say that the charger is connected.

According to the manufacturer, the trip point for the fourth light is supposed to be 12.7 volts (lowered from earlier versions). Some sources say that a freshly-charged battery can rest at 12.7 volts, especially if the surface charge has not been removed, so I suppose that the light could light without the charger being on. I have never seen it do it, though, so I guess that's the source of my skepticism.

Bill

I just put my new AGM battery in last week, went inside the unit and all 4 lights were on. I don't dispute that the 4th light "C" will be on when shore power is connected, but a charged battery can also show it. I think we are arguing semantics a bit, but my point is that unlike a battery tender which will show amber changing to green, the top battery light is either on or off and does not indicate whether a battery is charging or charged. I guess that is why I state that there is no "charging" indication on a TM.

Originally Posted by ib4classics

You probably ran water from the faucets in the trailer to purge the antifreez, that water went into your "gray"water holding tank.
Drain the gray water holding tank and see if the status board shows empty.
There may also be debris on the sensors in the gray water holding tank which could cause a false reading.
Filling the gray waer holding tank with water and bleach, let it soak, then drain may solve that problem.

Did that today, and indeed the status board does now show empty.