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Harley davidson flhx - fuel gauge not working, low fuel light on tank full

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Bad sending unit for fuel gauge in tank

Posted on May 09, 2010

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Posted on Jan 02, 2017

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K my 2005flht harleydavidson gage quit working and only fuel gage I have power to it and light work


The fuel gauge sender is mounted internally in the fuel tank. There is a three pin connector that will have a Yellow/White wire in it (the middle wire) under the center console. This is the sender wire. Connect an ohm meter between this wire and the black wire and check for the following readings:
If fuel tank is full, the reading should be 7-14 ohms. An empty tank should have a 74-95 ohm resistance. A half full tank will be approximately 30-38 ohms.
If you ground this wire that comes from the harness, the fuel gauge should read full. If not, then fault may be in wiring or the fuel gauge itself.
Remove the front fairing to gain access to the gauge. You should have 12 volts across the orange/white and black wires. If not, check accessory fuse. If 12 volts present ground the yellow/white wire at the gauge. Gauge should read full scale. If not, gauge faulty. If gauge reads full scale, check wiring from gauge to three pin plug under tank console.

Jul 27, 2014 | Harley Davidson Motorcycles

1 Answer

Why is my fuel line failing


sounds like low pressure on your fuel rail, this bike is fuel injected, correct?

Jun 01, 2014 | 2007 Harley Davidson FLHX Street Glide

1 Answer

I have a 07 flhx and the fuel gauge reads full all time


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 FLHT/C/U, FLTR if thefuel tank is full the meter reading should be 7-14 ohms and if the tank is empty the meter resistance reading should be 74-95 ohms resistance and a half full tank meter resistance reading will be approximately 30-38 ohms. For FLHR/C/S if the fuel tank isfull, the meter resistance reading should be 27-40 ohms, if the tank is empty 240-264 ohms and if half full 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 testingreplace the gauge itself.

May 10, 2014 | 2006 Harley Davidson FLHX Street Glide

1 Answer

Gauge reads empty full ride


Ground the yellow wire to see if the gauge goes to full, if not check all connections , if you can't find anything wrong with connections make sure you are getting voltage if all is good replace gauge.

Sep 04, 2013 | 2006 Harley Davidson FLHX Street Glide

1 Answer

2004 Dyna Super glide Fuel Gauge not working


Hi Anonymous, you could have a faulty sending unit or guage, there could be a problem with your wiring. On models with the fuel gauge posing as a left hand fuel cap the gauge is a press fit do not try to unscrew it, simply ample force lift up in a rocking motion to remove gauge. Disconnect wires to the gauge and with a set of positive and negative jumpers from the battery connect the positive jumper and flash the negative, gauge should peg full, if not replace gauge. With a test light check for power to the sending unit, then remove the sending unit and manually operate the float arm slowly with the correct wiring hooked up to the fuel gauge and sending unit and the ignition on, the gauge should respond accordingly if not replace the float arm assembly. For a free wiring diagram please visit the website below and good luck.
Harley Davidson Wiring Diagrams and Schematics

Aug 03, 2012 | 2008 Harley Davidson FLHX Street Glide

1 Answer

2002 dyna low fuel gauge is not accurate


Hi Anonymous, you could have a faulty sending unit or guage, there could be a problem with your wiring. On models with the fuel gauge posing as a left hand fuel cap the gauge is a press fit do not try to unscrew it, simply ample force lift up in a rocking motion to remove gauge. Disconnect wires to the gauge and with a set of positive and negative jumpers from the battery connect the positive jumper and flash the negative, gauge should peg full, if not replace gauge. With a test light check for power to the sending unit, then remove the sending unit and manually operate the float arm slowly with the correct wiring hooked up to the fuel gauge and sending unit and the ignition on, the gauge should respond accordingly if not replace the float arm assembly. For a free wiring diagram please visit the website below and good luck.
Harley Davidson Wiring Diagrams and Schematics

May 30, 2012 | 2002 Harley Davidson FXDL Dyna Low Rider

1 Answer

Fuel gauge on 2002 street glide work then doesn't , it kicks back and forth what could be the problem.


Hi Eric_prior, you could have a faulty sending unit or guage, there could be a problem with your wiring. On models with the fuel gauge posing as a left hand fuel cap the gauge is a press fit do not try to unscrew it, simply ample force lift up in a rocking motion to remove gauge. Disconnect wires to the gauge and with a set of positive and negative jumpers from the battery connect the positive jumper and flash the negative, gauge should peg full, if not replace gauge. With a test light check for power to the sending unit, then remove the sending unit and manually operate the float arm slowly with the correct wiring hooked up to the fuel gauge and sending unit and the ignition on, the gauge should respond accordingly if not replace the float arm assembly. For a free wiring diagram please visit the website below and good luck. Harley Davidson Wiring Diagrams and Schematics

Sep 10, 2010 | 2008 Harley Davidson FLHX Street Glide

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