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Old 09-26-2013, 09:05 PM   #15
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Ray,IN's Avatar
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Location: North America somewhere
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I've been told behind the dress-plate for the sensor readout is an adjustable pot to re-tune the sensor level readout when it gets out of whack. I've never looked to confirm it though. If you're sure your holding tanks are clean, it might be an option if true.

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Old 09-27-2013, 02:11 AM   #16
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Ford Super Duty Owner
Join Date: Oct 2010
Location: Cold Spring , Minnesota
Posts: 256
Originally Posted by gramps66 View Post
I m sure this has been discussed before. We have a 2009 HR Endevoure. I have tried the wand in the toilet, have hooked hose to tank clean out, tried chemicals, ice in toilet, heavy duty Dawn dish soap, hot water, In both tanks Black always flickers on the full and the Gray flickers between 1/2 and 3/4 all while empty. I have checked wires on tanks and on gauges all have good connections. I know we can go about 2 weeks between emptying. But it would be nice to press button and know. Next step is to take Coach in and have new sensors. Anything else to do or try. Its under warranty but taking it a dealer is pain in the ass!!!!!
Gramps Please note: As previously stated, use DAWN DISH WASHING SOAP, [not laundry soap]
You stated that you used the wand in the toilet but I doubt that is was the 'Camco 40074 RV Flexible Swivel Stick'.

Enter that full name on Amazon.com for the picture & description & scroll down slightly to see the brass shut off valve. Order both items & they ship free. Read the several pages of positive comments & they tell you to order he brass valve at the same time. It cleans my tank shinny clean. It makes one hell of a racket on the bottom of the tank but I don't worry about that. When I clean my tank at the end of the season I give it a second cleaning by tilting the entire motorhome up on the left side & I insert it thru the drain valve opening and give it another cleaning. Finish & close the tank valve before leveling the motorhome & draining the last amount.

I have a opening under my shower to the tank compartment that allows me to connect the water hose in the bathroom without dragging the hose thru the motorhome.

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Old 09-28-2013, 09:39 AM   #17
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I have tried various methods of keeping the tanks clean and have settled on RV Digest-it as my best option. For the grey tank, I stay away from anti-bacterial soaps as this product is a bacterial based cleaner. It took a couple of tankfuls to see the gauges show more accurately and the household TP seems to be well broken down. I do more camping than driving so sometimes spend months in one spot. As a result, I don't get the splashing effect of driving so make sure the tanks are quite full before dumping. This allows cleaning action high up on the sidewalls of the tank.

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gray tank, tank

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