LED electronics question

[Pin]

It seems I am not smart enough...

I have replaced a filament-bulb warning light with an LED one on my motorcycle, but it's always on.

The problem is that the light is ECU controlled.
When it's on, it gets 11.7VDC (with 5 ohm to battery). When it's supposed to be off, it still gets 5VDC (500ohm to battery), and this is enough to light an LED (but not a bulb).

Any ideas on how to fix this?

I have tried using a relay, but a 12V one flickers at 5V, and a 24V one wont close at 12V.

Anyone have a voltage dependent circuit diagram??? Beginning to get frustrated... :shakehead I really hope I don't have to put the ugly bulb back in....

Cheers,


Dave

 

[qwertyydude]

You're getting a slight current leakage even when it's off. The easy way to fix this is probably put a 75 ohm 1/2 watt resistor parallel with the light bulb to shunt current away from the bulb when it's off.

 

[CampingLED]

You can build a simple Transistor + 3xResistor circuit to solve the problem, but why not try 3 x LEDs in series. It will be easier and brighter.

 

[moviles]

many options 3 serie leds like say camping led
or :

a with transistor and zener
b with power zener 7-10W... maybe hard to find
c with 5 -7 2 amp diodes and resitor

and much much more options maybe the most easy the option c or 3 serie leds

 

[ab1ht]

Pin,

If moviles's options don't work for you for some reason, I can easily design something for you if you have the room for the circuit. How much room do you have? What kinds of parts do you already have?

-Paul