Grieu-clarke Posted January 2, 2016 Share Posted January 2, 2016 Hi Guys, I have a question, that's why I'm here!!! I have changed the dashboard in my 300tdi 110 for a td5 unit. After following some very good posts on this site it is almost complete. The problem I have is that the fuel light is always on even with a full tank of fuel, fuel gauge works fine though. Just to complicate maters it's running a 3.9 in a td5 chassis with a td5 fuel tank so no separate fuel level sensor as it is all in the pump. Surely I must be able to get the fuel light to work? Quote Link to comment Share on other sites More sharing options...
oneandtwo Posted January 3, 2016 Share Posted January 3, 2016 Mine did exactly the same, I couldn't work out why. I then tried a different speedo (speedo controls the fuel gauge) and it worked properly so in my case it must be a problem with the internal circuitry. Quote Link to comment Share on other sites More sharing options...
western Posted January 3, 2016 Share Posted January 3, 2016 I just wired my low fuel light direct from the tank sender to the warning light on dash panel. Quote Link to comment Share on other sites More sharing options...
dailysleaze Posted January 3, 2016 Share Posted January 3, 2016 As you're using the Td5 sender, you'll need to follow the intended wiring route. There should be a white/orange wire coming from one of the speedo plugs on pin 1. This should run to pin 3 of the 20 pin instrument pack plug. If this is correct, then the fuel light is turned on by switching to earth, so something is earthing along the way. This could be a defective speedo (where the WO wire comes from) Quote Link to comment Share on other sites More sharing options...
Grieu-clarke Posted January 3, 2016 Author Share Posted January 3, 2016 Ok some vital info that I forgot to mention, because it is a v8 it is using a v8 disco In tank fuel pump which is also the level sensor, I have now tried a known working speedo and it performs the same as mine Quote Link to comment Share on other sites More sharing options...
Anderzander Posted January 3, 2016 Share Posted January 3, 2016 How is the Disco sensor wired ? Quote Link to comment Share on other sites More sharing options...
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