In preparation for a short 2 day voyage in protected waters I checked the fuel
on board via the standard VDO electrical
panel installed in the Oceanis
range of yachts (mine is a 2007 Oceanis
The multi function LCD display when in fuel
gauge mode is showing the fuel tank
as 100% full which struck me as a little odd as I felt the tank was about 75% full. Toggling the display with the pushbuttons revealed that the two water tanks
were also showing as 100% full. So I tested this and found that I could put about 20 gallons (90 litres) into water tank #1 so the tank could only have been about 50% full when the display was incorrectly showing it as 100% full. The display's voltage mode is working perfectly - showing correct voltages for all 3 banks of batteries
So it appears I may have a problem at the panel ... the gauge is showing all tanks
being 100% full when I know them to be less than full. I don't believe I have multiple concurrent sender unit failures.
Does anyone have experience of this problem, or know what tests I can conduct to confirm the problem source? Is this an electronic failure, or an electrical
issue (i.e. a shared bad earth)?
On the rear of the panel the VDO PCB which is the LCD voltage/fuel/water gauge etc. module has "Carte Monitoring 010142" on a small white sticker adhered to it.
My panel is very similar to the one pictured below which picture I found on the web.
I could check the sender unit at each tank with a multimeter and work
back from there - what typical resistance reading should I expect when the tank is full versus empty? I am thinking that when full the reading would be 0 ohms? Empty would be ?? ohms?
All help appreciated.