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Yamaha Virago Low Fuel Level Sensor Repair

A short video on how I went about understanding, troubleshooting and repairing the low fuel level system on my 1984 Yamaha Virago (XV1000). First sign the system wasn't working is that the low fuel light (in the tach) never came on even when I knew the main fuel tank was almost empty and the light was good. This circuit is pretty much the same as all Viragos that have a low fuel warning light. There is a sensor in the fuel tank but there is no documentation on how it works, what it is or specifically any technical information on how to determine if it's working or not. Turns out that the sensor is a fairly standard 1kohm thermistor in series with the low fuel light. I spent a considerable amount of time reviewing the schematic and trying to find information elsewhere but all I got was either confusing or contradicting stories (for example, most Honda low level fuel circuit thermistors are 10k and they will not work with this bike). After figuring out how it's supposed to work and determining that the sensor in the tank had failed (thermistor), I had to go backwards to build a test jig to make sure the rest of the system was still working. Turns out it was all good except for the sensor, which I repaired. This is all shown in the video. One thing to remember is that if the low fuel light does not work and the thermistor has failed open (which is usually how they fail) then the ON/RES switch will not work. That doesn't mean your bike isn't going to run properly, it just means that there is no longer any way the bike can alert you to a low fuel condition. Once the repair is completed I plan on going on a test ride to make sure it all works properly. A few sources for either the thermistor in the can (more expensive but easier to install) or the stand-alone thermistor (cheapest but requires that you open the can and do a lot of intricate soldering). https://www.be-electronics.com/produc... https://www.ebay.com/itm/252492475091 https://spiyda.com/thermistor-sender-... https://tinyurl.com/3x88dxtp Music courtesy of Tunetank www.tunetank.com_3496_moonlight_by_crystal-squad