fuel and temp gauges not working
Posted: 24 Jan 2016, 20:55
Hello all. Help needed with fuel and temp gauges suddenly not working. 1984 1.9DG.
I’ve removed the dash cover to access the back of the temp gauge and with the ignition on (not engine running) spanned the ground (middle) terminal to the 10V terminal and the multimeter reads 9.96V. When I span the middle and other side (temp signal) it reads the same: is this right or does it suggest a short?
Battery reads 12.6V.
With a piece of wire I’ve shorted the ground to each other pin and the temp gauge doesn’t move.
When I earth the cable connected to the thermostat sensor (yellow and red insulation) again no change to the gauge (with the ignition on).
When I turn on the ignition the LED flashes for a few seconds then stops flashing. Header tank is full to brim.
Does this show the gauge faulty or do I also need to test the voltage regulator as in the wikihttps://club8090.co.uk/wiki/VW_Electrics_Non_working_temperature_and/or_fuel_gauges" onclick="window.open(this.href);return false;
Also, I need to check the fuel sender is connected properly, so will have to drop the tank when I can. What’s the minimum volume of fuel needed in the tank for the gauge to register? I think its near empty so will top up after checking connections.
Advice and knowledge appreciated.
I’ve removed the dash cover to access the back of the temp gauge and with the ignition on (not engine running) spanned the ground (middle) terminal to the 10V terminal and the multimeter reads 9.96V. When I span the middle and other side (temp signal) it reads the same: is this right or does it suggest a short?
Battery reads 12.6V.
With a piece of wire I’ve shorted the ground to each other pin and the temp gauge doesn’t move.
When I earth the cable connected to the thermostat sensor (yellow and red insulation) again no change to the gauge (with the ignition on).
When I turn on the ignition the LED flashes for a few seconds then stops flashing. Header tank is full to brim.
Does this show the gauge faulty or do I also need to test the voltage regulator as in the wikihttps://club8090.co.uk/wiki/VW_Electrics_Non_working_temperature_and/or_fuel_gauges" onclick="window.open(this.href);return false;
Also, I need to check the fuel sender is connected properly, so will have to drop the tank when I can. What’s the minimum volume of fuel needed in the tank for the gauge to register? I think its near empty so will top up after checking connections.
Advice and knowledge appreciated.