My h49 has Wema tank sensors. The water tank sensors have stopped working. I used a magnet to test the sensors to see if the fault rested in the sensor, wiring or gauge. The magnet indicated that the fault was in the sensor. Has anyone replaced the magnet on/in the float or is it worth the hassle vs getting new sensors?
Tank Sensors
- Thread starter Boiler
- Start date
The old sensor had a problem when the float became waterlogged.
I replaced mine.
Check here for the right size.
Wema = KUS
Jim...
I replaced mine.
Check here for the right size.
Wema = KUS
Jim...
The floats on the sensors work are still floating, they have just lost their magnetic field. Talking to a mechanic friend who works on BMWs, this is a common problem with these type of gauges. I was just hoping for a $.50 solution vs a $50 solution.The old sensor had a problem when the float became waterlogged.
I replaced mine.
Check here for the right size.
Wema = KUS
Jim...
Yes, I have done this, and the sensors work fine now. I did a post on this awhile ago.
The problem is that the reed switches aren’t properly specified. (Read my post )
The problem is that the reed switches aren’t properly specified. (Read my post )
No such thing as a 50 cent solution on a boat!
Lowes had some ceramic magnets about 1" x 3/16" x 3/16" for about 4.25 with tax, there were 8 in the pack. Drilled a 1/4" hole in the float and pressed in the magnet. I slid the magnet to different depths on sensor rod and the sensor seems to be working. Time will tell.
Here is the guide I received from WEMA Kus, in 2022 when my fresh water tank sensor completely deteriorated. It was when WEMA stopped farming out their manufacturing to lesser quality suppliers.
If your sensor seems to be working now this is an excellent check method. Very straight forward and simple.
Boat Sending Unit
use this method, it comes from WEMA Gauges.
To test the sender simply:
If you don't get the expected resistance reading on the multimeter then the sender is at fault and will need replacing.
If your sensor seems to be working now this is an excellent check method. Very straight forward and simple.
Boat Sending Unit
use this method, it comes from WEMA Gauges.
To test the sender simply:
- Disconnect the two wires on top of the sender.
- Remove the sender from the tank.
- Connect the wires on the sender to a multimeter.
- Set the multimeter to resistance [Ω ohms]
- Move the float to the top of the sender and take a reading on the multimeter:
- At the top of the sender (full) the resistance should be:
- European specification - 190 ohms
- American specification - 30 ohms
- Move the float to the bottom of the sender and take a second reading:
- At the bottom of the sender (empty) the resistance should be:
- European specification - 0 ohms
- American specification - 240 ohms
- At the bottom of the sender (empty) the resistance should be:
If you don't get the expected resistance reading on the multimeter then the sender is at fault and will need replacing.
