When the ignition switch is ON the fuel gauge is connected to 12 VDC, current flows through the gauge and the variable resistor in the fuel gauge sending unit to ground. The sending unit float controls the amount of resistance in the variable resistor. Malfunctioning fuel gauges may be the result of a fuel gauge sender or a fuel gauge not being properly grounded OR there may be a defect in the fuel gauge sender or in the fuel gauge itself OR there may be an open circuit caused by a loose or disconnected connection or a broken wire between the ignition switch to the fuel gauge.
A suspect fuel gauge system can be tested by FIRST removing the gauge and grounding the Y/W wire of the fuel gauge sender located at the bottom of the gauge, turning the ignition switch ON at which point the fuel gauge must indicate FULL. And if it does so then the fuel gauge is functioning correctly.And if it does not read FULL then get a multimeter set to the RX1 scale and measure the resistance of the sending unit by placing one of the meter probes on the Y/W wire and the other probe on a good ground. THEN for Softail if the fuel tank is full, the reading should be 27-40 ohms. an empty tank should have a 240-264 ohm resistance and a half full tank will be approximately 97-118 ohms. FOR ALL MODELS if there is a very highmeter resistance or infinity reading the sender may be "open" or not grounded. In this case check to see if the sender and fuel tank are grounded by placing one of the ohmmeter probes on the flange of the sender and the other probe on crankcase and if the ground is good the meter must indicate one ohm or less and if the reading is one ohm or less the sender is defective and requires replacement and if a higher resistance reading is obtained you will need to check for a poor ground wire. THENyou can check the voltage to the O/W (+) wire and the BK (-) wire of the fuel gauge connector if the gauge did not indicate FULL and the correct reading will depend on the source voltage and the level of fuel in the tank or the position of the sender float arm on the variable resistor etc. If there is NO battery voltage present there may be a broken, highly corroded or disconnected power wire. If you cannot find a problem using the above testing replace the gauge itself.
SOURCE: Fuel Gauge stays on empty
sounds like a fuel sending unit problem or an issue with the sending unit's float. May need replacing. HD- hundred dollar
SOURCE: fuel gauge not woking 2006 fi harley softtail standard
Check your fuses and for possible shorted or cut wiring.
SOURCE: gauge will power up. .. stays on full, turn power
If you'll contact me directly, I'll send you some information on the fuel gauge. The info is or a 1994 FXDWG but the gauge works the same way on all Harley bikes. They may be laid out a bit different but the principle is the same. Contact me at [email protected] and I'll send you the information. This forum only allows files no bigger than 150Kb and they're bigger than that. Don't forget to remind me of what you want, I get lots of request for info.
Steve
http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html
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•
Oldsmobile Temperature Gauge Lamp Switch?
-----------------
http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
------------
http://schematicsdiagram.blogspot.com/2011/12/temperature-gauge-went-up.html
------------
http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html
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http://technoanswers.blogspot.in/2012/02/how-to-remove-instrument-panel-on.html
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If
all voltages checked ok, then most probably its faulty instrument cluster board
on which gauges are connected. Yes if cluster circuit board looks ok, then also
it can be faulty. Somewhere there is minute short or burn on board then such
problem arises.
Also
check the fuse box. One under hood and other under dash.
Inspect
each and every fuse and see if all are fine or not.
---------------
For
more troubleshooting on these cluster gauges I suggest you to refer the list of
help links mentioned below. Its step by step instructions will help you to
confirm the exact cause of problem in these conditions: ---------
Click
the link below: ------
2004 Toyota Tundra:
Oil Gauge and Temp Gauge Not Working?
http://howtobyme.blogspot.in/2012/05/2004-toyota-tundra-oil-gauge-and-temp.html
--------------
2005 Lexus SC430: Fuel Door, Dome light and Fuel Gauge Fuse
Location?
http://howtobyme.blogspot.in/2012/05/2005-lexus-sc430-fuel-door-will-not.html
----------
Toyota 4Runner:
Temperature Gauge Sensor
http://technoanswers.blogspot.in/2012/04/toyota-4runner-temperature-gauge-sensor.html
------------
Temperature gauge sits over half way mark?
http://schematicsdiagram.blogspot.in/2012/04/temperature-gauge-sits-over-half-way.html
---------------
Heater blows intermittently and temp gauge goes erratic?
http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html
----------
Temperature gauge does not move and no heat when heater is
ON?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html
-----------
2003 Pontiac
Grand Prix: Erratic Fuel Gauge?
http://technoanswers.blogspot.in/2012/06/2003-pontiac-grand-prix-erratic-fuel.html
-----------
Temperature gauge keeps fluctuating up and down close to
red?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html
-------------
Temperature gauge on the dash quit working on Pontiac Grand
Prix?
http://technoanswers.blogspot.com/2012/01/temperature-gauge-on-dash-quit-working.html
---------------
Fuel gauge jumps from empty to full?
http://schematicsdiagram.blogspot.com/2011/12/fuel-gauge-jumps-from-empty-to-full.html
--------------
Gas gauge stuck on empty on 2002 Mercedes Benz 240c?
http://repairhelpcenter.blogspot.in/2012/02/gas-gauge-stuck-on-empty-on-2002.html
---------------
• Oldsmobile
Temperature Gauge Lamp Switch?
-----------------
Fuel gauge drops to Empty?
http://technoanswers.blogspot.com/2012/01/fuel-gauge-drops-to-empty.html
----------------
Dodge neon gauges not working?
http://technoanswers.blogspot.in/2012/02/dodge-neon-gauges-not-working.html
------------
Temperature gauge went up?
http://schematicsdiagram.blogspot.com/2011/12/temperature-gauge-went-up.html
------------
Temperature gauge stays At cold on jaguar?
http://technoanswers.blogspot.in/2012/02/temperature-gauge-stays-at-cold-on.html
-----------
How to replace Instrument panel and dashboard on Toyota
car?
http://repairhelpcenter.blogspot.in/2012/02/how-to-replace-instrument-panel-and.html
-----------
How to remove instrument panel on Chevrolet car?
http://technoanswers.blogspot.in/2012/02/how-to-remove-instrument-panel-on.html
-----------
How to remove control panel on Buick regal?
http://howtobyme.blogspot.in/2012/02/how-to-remove-control-panel-on-buick.html
---------------
These
details will help.
Thanks.
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