I think I should be able to grasp something from this question but I'm not sure if my case is the same or not. Would be great if I can get enlightment on this.
In my case I'm replacing incandescent bulb with a 12V (resistor-equipped) LED chip of the same socket. The lamp is for battery charge indicator (+ - battery icon that glows when ignition is ON but engine is not running then off when engine is running unless there's problem with battery charging)
I think there is some direct connection between the bulb and alternator; then this makes me think I should be more cautious when fixing this problem. I also guess every <=90s car has the same problem: we should not use LED bulbs to replace incandescent bulb just for battery charging indicator.
The LED is dimly lit when it is supposed to be off during engine running, but totally off when the engine is not running and ignition is not in ON position.
Should I use bleeder resistor? how to measure how much resistance I should use? or should I put inline resistor before the indicator LED?
If I should get answer from the aforementioned link, please kindly let me know. Thankyou for any inputs.