I performed the LED dash light replacement viewtopic.php?t=10998 and had to replace the discontinued SuperbrightLED.com WLED-W4-32 with their 194-WWHP5. In spite of crossing the leads on the Low Fuel indicator with the recommended 470K ohm/1/2 watt resistor, this LED glows continuously, very bright with initial 'key on' and reverting quickly do a dull, continuous glow. Spec for the original WLED-W4-32 called out a Current Draw of 20mA, but replacement 194-WWHP5 doesn't state the Current Draw in the specs tho it does call out double the Comparable Incandescent Wattage (3-5 vs 5-10 watt). Fuel tank is full, btw.
Can any electronic wizards out there help me troubleshoot this ALWAYS ON 'Low Fuel' indicator? I also have on-hand some 1K ohm/1/4 watt resistors if they could be part of a solution.
LED Dash Lights, but 'Low Fuel' ALWAYS ON!
- MikeB
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Re: LED Dash Lights, but 'Low Fuel' ALWAYS ON!
I too converted my dash lights to LED and I had a similar issue with that LED's staying illuminated or glowing when it should have been out.
So, when I removed the instrument panel again to take care of hot spots and adding bulbs I had left out, behind the LCD screen, instead of messing around and trying to figure out what the issue was and trying other resistors, I simply put a 194 bulb in place of the Low Fuel LED. The bulb is illuminated so infrequently, the 194 bulb I used there will out live me.
So, when I removed the instrument panel again to take care of hot spots and adding bulbs I had left out, behind the LCD screen, instead of messing around and trying to figure out what the issue was and trying other resistors, I simply put a 194 bulb in place of the Low Fuel LED. The bulb is illuminated so infrequently, the 194 bulb I used there will out live me.
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
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Retired in Tacoma, WA
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
- erkmann
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Re: LED Dash Lights, but 'Low Fuel' ALWAYS ON!
Mike, I was kinda leanin' that way too. Thanks for your comments.
Chris
Chris
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Re: LED Dash Lights, but 'Low Fuel' ALWAYS ON!
That is exactly what I did also.MikeB wrote: ↑Mon May 17, 2021 9:08 pm I too converted my dash lights to LED and I had a similar issue with that LED's staying illuminated or glowing when it should have been out.
So, when I removed the instrument panel again to take care of hot spots and adding bulbs I had left out, behind the LCD screen, instead of messing around and trying to figure out what the issue was and trying other resistors, I simply put a 194 bulb in place of the Low Fuel LED. The bulb is illuminated so infrequently, the 194 bulb I used there will out live me.
“Fight the fight and do what is right“
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Re: LED Dash Lights, but 'Low Fuel' ALWAYS ON!
My solution to this was to rip out the hasn't-failed-yet-but-will thermistor low fuel sensor and replace it with a float switch. I put a flasher circuit in there like Virgilmobile did, but you don't have to. I then calibrated it so the float switch closed when I had exactly one gallon remaining.
now when I get down to my last gallon, my low-fuel light starts flashing in my face. Can't miss it.
now when I get down to my last gallon, my low-fuel light starts flashing in my face. Can't miss it.