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Old 08-10-2022, 09:13 AM   #1
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Shore power messing with readings.

Hi, Has anyone else had a problem with the shore power messing with the tank level readings?

When I'm hooked to shore power, my tank level readings are all showing full, yet if I turn off the main breaker, or disconnect the cable plug, the readings are good. Empty, 1/3. 2/3 or full, it doesn't matter.

It must be the AC giving off a magnetic signal or something like that as far as I can figure.

This is on our 2008 Winnebago Adventurer 38J, and has done it ever since we bought it used in 2015.
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Old 08-10-2022, 09:24 AM   #2
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What is the charge rate , to the coach batteries when on shore power ?

What brand of monitor panel in your coach ?
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Old 08-10-2022, 09:29 AM   #3
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Maybe a silly question but is this with the coach battery disconnect switch in the on (connected) position?
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Old 08-10-2022, 09:42 AM   #4
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What is the charge rate , to the coach batteries when on shore power ?

What brand of monitor panel in your coach ?
It does not matter what the batteries are charging at. Fully charged (float), or down at 50%.

It is a "True Level" tank monitor system with the sensors on the outside of the tanks.

It works great without shore power, but as soon as I hook up, even to a 15, 30 or 50 amp service, the level reading go to the top!

I have been thinking that moving some wires around might fix it, but where to start?
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Old 08-10-2022, 09:51 AM   #5
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Maybe a silly question but is this with the coach battery disconnect switch in the on (connected) position?
Coach batteries are on when it's doing this. I never turn that switch off intentionally, but did accidentally one time, but didn't check the levels. I will have to go out and try that.
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Old 08-10-2022, 09:57 AM   #6
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Maybe a silly question but is this with the coach battery disconnect switch in the on (connected) position?


Nope, no change! On or off, still all reading full! :(
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Old 08-10-2022, 03:18 PM   #7
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I would turn off the inverter breaker in the breaker panel and see if the issue persist. The inverter is doing the charging when plugged into shore power, unless you have a converter also. Some older coaches only had an inverter for the tv's in the overhead. Can you verify which setup you have and turn off that breaker to see if changes.
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Old 08-11-2022, 09:47 AM   #8
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I would turn off the inverter breaker in the breaker panel and see if the issue persist. The inverter is doing the charging when plugged into shore power, unless you have a converter also. Some older coaches only had an inverter for the tv's in the overhead. Can you verify which setup you have and turn off that breaker to see if changes.


BINGO! I turned off the breakers one at a time and the one marked ďRefrig/convĒ is the culprit. Fridge is turned off, so itís the converter. AKA the battery charger.

I have a separate inverter to run the TVs when not on shore power, and it doesnít affect the sensors.

Now I know what, I just have to figure out why. Iím wondering if some AC lines are running too close to the sensor wires???
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Old 08-11-2022, 10:21 AM   #9
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I unplugged the charger/converter and the problem goes away. So itís definitely the problem, how can it affect the level sensors is the question.

Plug is circled in the picture. Click image for larger version

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Old 08-13-2022, 03:32 PM   #10
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Sounds almost like a GROUND issue to me. Disconnect form shore power and check your Shore power cable to the Transfer switch on all legs. basically OHM it out on each leg to ground and to each other. While you are at it make sure all of the lugs in the transfer switch are tight.

Before all of that, did it check it with the generator running? That is big source of AC going to the same place as shore power once running.???
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Old 08-14-2022, 06:10 AM   #11
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Sounds almost like a GROUND issue to me. Disconnect form shore power and check your Shore power cable to the Transfer switch on all legs. basically OHM it out on each leg to ground and to each other. While you are at it make sure all of the lugs in the transfer switch are tight.

Before all of that, did it check it with the generator running? That is big source of AC going to the same place as shore power once running.???
Thanks, I will have to check out the connections.

It does it with the genset running also.

If I unplug the charger/converter, all is good, so I'm thinking it may be something to do with the connections from it to the batteries. I will do some more checking next week after I get back from a fishing trip with a couple of my buddies.
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Old 08-14-2022, 06:50 PM   #12
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Thanks, I will have to check out the connections.

It does it with the genset running also.

If I unplug the charger/converter, all is good, so I'm thinking it may be something to do with the connections from it to the batteries. I will do some more checking next week after I get back from a fishing trip with a couple of my buddies.
Catch one for me.
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Old 08-15-2022, 10:47 PM   #13
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Catch one for me.


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The pelicans are doing well! We have had several triple headers! Somewhere around 50 fish in the first day. Maybe 3 1/2 hours. We are strictly catch and release, but the locals say that the rainbows are good eating.
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Old 08-17-2022, 06:52 AM   #14
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We had A similar issue with the tank sensors on a previous coach we had (Entegra). The factory service tech taped a piece of tin foil over the sensor to shield the sensor from emf.
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