Low Fuel Light


Information and questions on GL1500 Goldwings (1988-2000)
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Fiberthree
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Location: Behind the windshield
Motorcycle: Black 1999 GL1500SE

Low Fuel Light

Post by Fiberthree »



I recently replaced the fuel petcock diaphragm which stopped the puddle of gas from forming in the overflow tray. Since then the last two times I have filled up the low fuel light has failed to come on. Both times I have put in over 5.6 gallons. My light usually came on with one gallon left in the tank. I have no problem troubleshooting electrical but my present computer refuses to load Honda's CD Service Manual because of the "incompatible" operating system, so I don't have access to the electrical wiring diagrams. Anybody have one I can view for reference or suggest an excellent alternative? Thanks.


Ed

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Bluewaterhooker0
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Motorcycle: 1997 Goldwing GL 1500 SE
2008 GL1800 with 2018 California Side Car Trike Conversion

Re: Low Fuel Light

Post by Bluewaterhooker0 »

These should help. They are from a '94 manual, but I doubt there were any changes for a '99.
From what I hear, that thermistor sensor in the tank is a weak point. I would test it, and the circuitry to the dash as described, first.
You should be able to test the thermistor from outside the tank just reading resistance (ohms).
The dash circuitry can be tested at the same location as described.
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Fiberthree
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Location: Behind the windshield
Motorcycle: Black 1999 GL1500SE

Re: Low Fuel Light

Post by Fiberthree »

Thank you. The light comes on when I first turn the key on, so I know the bulb is good. Your diagrams will help a lot.
Ed

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WingAdmin
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Re: Low Fuel Light

Post by WingAdmin »

The thermistor in the fuel tank that operates the low fuel light is a common failure item.

You might want to try what virgilmobile and I both did, replace this with a new-improved, never-fails item:

viewtopic.php?t=11167
BHeadley58
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Joined: Thu Jul 08, 2021 1:56 pm
Location: Omaha, NE
Motorcycle: 1989 GL1500A

Re: Low Fuel Light

Post by BHeadley58 »

Just a side note ..

I relamped the instrument cluster on a 1989 GL1500A with LED bulbs, and the only one that caused problems was the Low Fuel Light. The LED bulb would come on even though the tank wasn't empty. The workaround was to splice a 51 Ohm, 6 Watt wirewound resistor (overkill on the wattage, but better safe than sorry) onto the Low Fuel bulb socket - to mimic a standard incandescent bulb. Now it works as expected.

The problem is the incandescent bulb draws a proportional current no matter what voltage the fuel sensor supplies to it, but the bulb doesn't really 'light up' until around 6 volts is applied. LED bulbs 'conduct' around 3 volts and then draw a continuous current, giving a false Low Fuel warning.
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MikeB
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Re: Low Fuel Light

Post by MikeB »

I and a few others have had the same issue with the LED illuminating when it should be out. The simplest fix was the reinstall the OEM tungsten bulb. As infrequently as it on, it will out life me and my kids before it burns out. And it does not draw enough current by itself to be a problem.


MikeB
1998 - GL1500 w/184,500 miles ~ 2017 - GL1800 w/13000 miles
USAF Avionics Communications Tech - 1968 - 1986 / Flight Engineer C-130E - C-141B - 1986 - 1992. Retired
Industrial Maintenance Tech - 1992 - 2014
Retired in Tacoma, WA
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