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Fuel Gauge Light not working....

Posted: Mon Dec 24, 2018 9:51 am
by SparkEE
This is a new VDO 301 040 model fuel gauge. The gauge works, but at night, the backlight does not illuminate. I checked the wiring against the Pinz color schematic and the wiring diagram of the gauge. A few things seem off. The two circled areas seem to be missing a wire. Is that correct? See photo below...

Re: Fuel Gauge Light not working....

Posted: Mon Dec 24, 2018 11:04 am
by pcolette
The bulb for the lighting of the gauge needs to have 2 wires to work properly. You appear to have the ground wire (brown) for the bulb but no power wire. It’s easiest to just add a short wire to the bulb on an adjacent gauge. If the gauge itself is working than you have the other terminals connected properly.

Re: Fuel Gauge Light not working....

Posted: Mon Dec 24, 2018 11:17 am
by rmel
The lamp socket requires it’s own GND and 24v source.
Looks like your missing the ground on that lamp socket.

Re: Fuel Gauge Light not working....

Posted: Tue Aug 25, 2020 6:49 pm
by murrayjp
did it work
I am installing a same also