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Old 06-20-2018, 05:40 PM   #1
Senior Member
Baddad53's Avatar
Brand: Thor Motor Coach
Model: Axis 25.3
State: California
Posts: 443
THOR #2526
Thor Technical Support

First, let me say it was all my fault because I trusted the guy at Thor Technical Support. My black tank started showing errors on the tank level. I cleared it before using my spinning washer thingie made to flush the tank. Not this time. Purchased new sensors and crawled under the RV in the late evening to see their location on the tank. I didn't use a flashlight (my bad) and it looked like I could get to all of them. There are two types of sensors - one is replaceable and the other is glued to tank and is not. Called Thor Technical Support and asked which was installed on my RV. He said it was the replaceable kind. Got ready to do the swap out They are not. Used Horst Miracle Probes. Better design than original crap (pun intended).

From the photo, you can see that the chassis rail runs parallel to the sensor side of the tank. Not enough room for a drill to fit and its a plastic tank so I purchased an unibit and a 90-degree drill chuck which took a few days to get.
So a project which I could have done in an hour spread out over four days.

Best video on the subject : https://youtu.be/iABA43tHVXI

Top sensor I did not replace. Will have to jumper wire to location on tank I can drill. It's up against the gray water one which has a section that goes under the shower. Future project The white wire is the common return at the bottom of the tank. I also put some tape on the wire bundle which was laying on the top of the chassis rail. Other wires have sleeves when they are touching metal, not these.

All the tools I used

2016 Thor Axis 25.3 w/ 2011 2dr Wrangler in tow
Demco tow bar with Patriot braking
Bigfoot Automatic Levelers.
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Old 06-20-2018, 05:46 PM   #2
Senior Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: Florida
Posts: 611
THOR #4366
We have never payed much attention to the level sensors as never came across any over the years that worked right.
Flash light and look down the toilet has always worked the best for us since the late 80's.

2016 Axis 24.1 E-450 6 spd tranny
300 watts portable solar.
200 watts solar on the roof.
Wrangler JK dinghy
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Old 06-20-2018, 06:52 PM   #3
Senior Member
The Gritz Carlton's Avatar
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Georgia
Posts: 4,034
THOR #11130
Same here...the never ending story. You get the feeling in your nose when the tanks are nearing full.
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
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Old 06-20-2018, 08:54 PM   #4
Senior Member
Brand: Thor Motor Coach
State: Illinois
Posts: 212
THOR #5112
another same here. fresh water is only one i ever look at.
tigwelder is offline   Reply With Quote

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