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Old 09-03-2019, 03:25 PM   #1
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Low Tech Tank Measurement?

We're the optimistically-proud owners of a pretty gently used Holiday Rambler Savoy. Granted, it's a little long in the tooth but it looks really well cared for and it seems to fit the camping we're wanting to do pretty well, for now. Then there's this problem with the tank info center; the water heater and pump rocker switches light up nicely, but the indicators for the battery and tanks won't do anything. I've taken it off the wall and checked the board for visually-obvious shorts or disconnected wires, but so far, nothing. The entire trailer underbelly is buttoned up with Lamiplast and I haven't dedicated the time to open it up to trace wires.

In the interim, I was wondering if there's a low tech method for checking the gray tank level? The black tank method seems pretty intuitive, if a little distasteful, but I'm at a loss for how to stay out of trouble with the gray. Any ideas?

Thanks, and Happy Tuesday.
Brett
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Old 09-03-2019, 03:52 PM   #2
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In my trailer, the low tech way to know if the gray tank needs to be dumped is the shower won't drain. That means it's full. If you're trying to catch it before it won't fill anymore, I can't help you there.
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Old 09-03-2019, 04:21 PM   #3
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Perhaps the fresh water tank is clear, and you can tell how much is in it. If so, you can watch your fresh water. Generally, a large percent of the fresh water ends up in the grey tank. Once you get below half a tank of fresh, you can assume the grey is getting full. The black tank rarely or never gets full. If you have a 12 volt outlet anywhere in the trailer, you can buy a meter with some usb ports as well. Here is one similar to what I mean.https://www.amazon.ca/XCSOURCE-Charg...motive&sr=1-20
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Old 09-03-2019, 05:53 PM   #4
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@1bigmess: I guess the shower drain would be the first place Iíll notice being full and per holiday rambler I have 2-40 gal gray tanks so assuming I keep them separated at first and we donít go nuts with the galley tank I should have an idea of half full when the shower backs up. Thanks

@winniman: the fresh tank
Is tucked under that belly cover so I canít see it. Iíll go nuts not being able to micromanage all that water on my trailer so Iíll tear into the belly and sort it all out soon enough. As for the 12-volt connections...youíd think on a vehicle where over half the wiring is of the 12v variety there would be ONE 12v connector but I canít find a single one. I saw a nice aftermarket power center in one of the mod threads though and Iíll probably tackle that pretty soon too. Not sure how we survived without all the usb / Bluetooth/ wireless doodads way back in the late 2000s. Thanks for the ideas.
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Old 09-03-2019, 07:54 PM   #5
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Quote:
Originally Posted by 1bigmess View Post
In my trailer, the low tech way to know if the gray tank needs to be dumped is the shower won't drain. That means it's full. If you're trying to catch it before it won't fill anymore, I can't help you there.
X2 on the shower drain. I've had two travel trailers that had no tank indicators. Each only had one gray tank, and the shower was the low point. If I didn't dump before the gray tank filled up, the water would back up into the shower. Time to Dump!
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Old 09-03-2019, 09:51 PM   #6
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When toilet 'burps'.........time to dump black tank
When bathroom sink/shower drain slower then usual.....time to dump grey tank
When kitchen sink drains slow.......time to dump galley tank
When water pump goes 'buurrrrrrrp'.....should have refilled fresh water tank already
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