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Old 08-07-2019, 08:15 PM   #1
Junior Member
Join Date: Jan 2015
Location: Ashtabula, OH
Posts: 16
Thor Challenger Gray tanks

I'm a new owner of a 2015 Thor Challenger 34KT. Beautiful coach with 4000 miles on it. This past weekend took a hundred mile trip to check out the systems. Leaving the park on Sunday I drained the black and gray tank. The second gray tank (kitchen) nothing drained even though we did dishes for three days. Once home I started investigating and found the kitchen gray tank empty. I was able to verify the kitchen sink was draining to the rear gray tank.
Is there something I'm missing like a valve somewhere directing the kitchen sink to the front or back tank?

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Old 08-08-2019, 12:40 AM   #2
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Posts: 2,678
Hopefully somebody with the exact model and floorplan sees this thread and can answer definitively but I remember reading somewhere that depending on the floorplan, some Thor Challengers use the front gray tank only for the washer/dryer --or washer-- to drain into.

If nobody answers, call Thor and ask for the plumbing schematics for your model and floorplan. I've heard they will gladly send it to you in a PDF file. That way you'll know for sure what is draining into what tank. It may be a good idea to ask Thor for it anyway so you can keep it with the rest of your documents.

eta: ...after doing some searching around, Thor now has an owner's portal where you should be able to pick up things like the plumbing schematics online yourself once you register.

Thor Motor Coach Owners Resources page

"Brand new to the Thor Motor Coach website is an Owner’s Resource web-based portal that gives owners access to relevant and specific information on their motorhome, including factory-installed components and equipment, owner’s manuals, electrical diagrams, plumbing schematics and more."
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Old 08-09-2019, 04:41 PM   #3
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Join Date: Jan 2015
Location: Ashtabula, OH
Posts: 16
Thanks theroc. I never thought about the forward gray tank being for washer use. You maybe right on with this thougt. And thanks for the Thor contact info, I will definitely be hooking up to it for more info.
Jerry & Alisa
2015 Thor Challenger 37KT
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Old 08-09-2019, 04:57 PM   #4
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Join Date: Aug 2016
Location: payson, az
Posts: 880
run some water down the washer drain and see if it goes to that tank. we have a grey tank dedicated to the washer that we do not have. i do not know your floor plan and how it is plumbed. but in our case all tanks drain through a single common sewer connection. we put a valterra twist on valve on the sewer connection. we can close that valve and open the two factory installed grey tank valves and double our grey tank capacity.
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gray tank, tank, thor

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