LED low fuel indicator light - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 34 (permalink) Old Sep 24th, 2013, 12:04 pm Thread Starter
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LED low fuel indicator light

My low fuel indicator light did not work when I first got my bike, then after a few rides it started to work. Then the tank went dry for a year while I rebuilt the bike and I replaced my idiot light panel with a series of 4mm LEDs mounted to the triple tree. Now the low fuel light is on all the time, but occasionally flickers. Has anyone else done this? I heard somewhere (probably here) that the resistance of the bulb helps make the circuit work properly and an LED will not work the same without a resistor. Or is my sensor just dry and gummy and after a few tanks of fuel it will work properly again?
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post #2 of 34 (permalink) Old Sep 24th, 2013, 12:34 pm
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Guarantee its your fuel level sensor and not the bulb. They are notorious for breaking (mine included).

1999 750SS - 2010 Hypermotard 1100 EVO SP - 2016 KTM RC390 Track Bike
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post #3 of 34 (permalink) Old Sep 24th, 2013, 1:09 pm
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Quote:
Originally Posted by amehl View Post
Guarantee its your fuel level sensor and not the bulb. They are notorious for breaking (mine included).
+1 Here as well.. Expensive little buggers too.

99 Ducati 900ssie
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post #4 of 34 (permalink) Old Sep 24th, 2013, 4:02 pm
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Same issue

I have the same issue after installing a motogadget motosign mini led indicator panel on my 2001 m900.
The light stays on all the time... I can confirm that the sensor is not toast if I put my old gauge cluster on.

After looking for more information I found this info on motogadget's site:

(see attached image)

I ordered a set of 10 resistors off ebay for cheap, but I have yet to re-wire everything.
I assume these would be wired in parallel to the +/- wires?
I'm not an electrical wiz so I guess it's going to be trial by fire if nobody can confirm...

By the way if anybody wants a resistor just let me know.
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post #5 of 34 (permalink) Old Sep 24th, 2013, 4:42 pm Thread Starter
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Do you wire it in line as the signal power wire comes to the light?
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post #6 of 34 (permalink) Old Sep 24th, 2013, 5:00 pm
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Resistor

I assume it is wired in parallel (one side to + the other to -) just like led indicators. Again, this is just my assumption...

2006 999s monoposto
2012 848 evo cafe
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post #7 of 34 (permalink) Old Sep 25th, 2013, 7:55 am
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The reason your LED is on is probably because most LED's only need a few milliamps and around half a volt to operate. That's why you should always use a current limiting resisitor in series with the LED. It doesn't matter if it's before or after the LED. If you don't have an ammeter to really dial in the current (20mA is probably a safe bet for most LED's), try a 1k Ohm resistor and see if that works. Ohms Law is your friend!

12V/.02A = 600 Ohms. Close enough to a 1k resistor you probably already have laying around nearby.

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post #8 of 34 (permalink) Old Sep 25th, 2013, 9:45 am Thread Starter
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OK I would like to try the resistor, but Im confused. Am I wiring it in on the power side of the LED? Or am I bridging the positive and negative poles of the LED?
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post #9 of 34 (permalink) Old Sep 25th, 2013, 12:33 pm
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Quote:
Originally Posted by Twinlinemoto View Post
OK I would like to try the resistor, but Im confused. Am I wiring it in on the power side of the LED? Or am I bridging the positive and negative poles of the LED?
It doesn't matter if it's on the power or ground side of the LED. All that matters is that it is wired in series. NOT bridged across any points.

The single path should be from the supply, to one end of the resistor (doesn't matter which end), then to the anode of the LED (the longer of the two leads). The other end of the LED should then just be wired either to ground or the remainder of the system.

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post #10 of 34 (permalink) Old Sep 25th, 2013, 2:27 pm Thread Starter
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Sweet! I will try this probably next week.
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