Question about 2006 Harley Davidson FLHX Street Glide
The gauge reads full even when it is empty
Posted by Anonymous on
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.
Posted on Oct 14, 2014
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Posted on Jan 02, 2017
The circuit for a fuel gauge is: battery positive through the gauge resistor to the sending unit to the fuel tank(sheet metal) to the chassis to the battery negative. If you didn't remove the sending unit the most likely problem is the fuel tank is not grounded to the frame. Scrape some paint at the rear mounting bolt where you can't see it and re-tighten the bolt. If you removed the sending unit, check the cork gasket. There should be a staple in it that is the connection to the sheet metal. No kidding.
Posted on Dec 31, 2008
SOURCE: Fuel gauge issues
sounds like a bad ground or one of your wire was tightened down on the wire. you may want to remove it again to see if it was plugged up right. while loosening your bolts, check to see if it begins working
Posted on Oct 09, 2009
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 firstname.lastname@example.org 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.
Posted on Mar 09, 2011
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