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Led light turn on at specific Voltage

djmixalot

Dec 28, 2023
1
Joined
Dec 28, 2023
Messages
1
Hi,

Setup is very simple, updating led lights on a vehicle, the older 3" round led lights have been replaced with new ones.

This vehicle put out a constant ~10.2v on the lights wiring. (turn signals, brake lights, 3rd brake light) when the ECU drives the circuit to ground the voltage goes from ~10v to 12V and the lights light up accordingly.

The older lights, lets use turn signals as an example, would turn on when you activate the turn signals. When the turns signals were off they remain off despite the 10v.

These new round led lights have about a dozen led in this 3" round light. Due to the fact there is ~10v on the turn signal wiring, it lights up about 4 of the 12 led at all times. When you actually activate the turn signal, it turns on the other 8 led on and off as expected but these 4 remain on all the time.

The goal is to make the new lights work like the old lights. So a modification is needed for each of these lights. I'm looking for a clean solution since this needs to be done on each of the lights.

1. Running resistors in serious dimmed the 4 led which were on all the time but than none of the lights work when the turn signal is turned on.

2. Added a pair of diodes schottky but it made no difference.

Was thinking a comparator would be ideal however its all IC mounted and not ideal. I'm thinking maybe Zener diode would be the best option.

Thoughts?
 

danadak

Feb 19, 2021
771
Joined
Feb 19, 2021
Messages
771
Zener approach :



Regards, Dana.
 
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