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Old 11-30-2020, 06:16 AM   #1
Join Date: Oct 2020
Location: Newport
Posts: 76
New rig shakedown trip...tank sensor issue

So our family took out our new rig for a 5 night stay in Northeast GA over the holiday weekend. All went well but we did discover an issue where our #2 grey tank always reads empty. Almost certain that our grey tank #2 is the one the kitchen sink is connected to.

We have the In-Command system so our tank sensors are connected to some sort of sensor gateway that is then connected to the In-Command system.

I checked the plug at the In-Command BCM and it looks fine. When I disconnect it the other tanks read empty and when reconnected they display the appropriate levels.

Knowing that RV tank sensors are not very reliable anyway, I would still expect new grey tank sensors to work out of the gate.

Any ideas for troubleshooting?

2021 Keystone Cougar Half-Ton 32BHS 5th Wheel
2020 F-250SD, XLT Pre, CC, SWB, 4WD, FX4, HCTP, 6.7 PSD, 3.55 e-lock, Blue Jeans Metallic, Curt A16/R24 Slider
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Old 11-30-2020, 06:53 AM   #2
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Join Date: Jul 2014
Location: Modesto
Posts: 12,681
My first guess would be a bad ground at the gray tank sensor pack.


2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.

Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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Old 11-30-2020, 08:43 AM   #3
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Join Date: Apr 2020
Location: Canton
Posts: 223
Better double check which tanks are which. Mine are labelled backwards.

Black 1 and Grey 2 are the "front" tanks, and Black 2 / Grey 1 are the "rear" set. Makes perfect sense lol.

Also - have you tried tank flush? I betcha a dollar you need to flip the check valves - front is under 1/2 bath sink, and rear is under kitchen sink.

You could fill grey with fresh water and see to troubleshoot...check labelling, etc.


2019 GMC Sierra 2500HD 6.0L
2020 Cougar 32BHS
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