Hello,
short story:
I have a car light harness where i have added an 8Ohm wirewound 200W resistor parallel to the LEDs. When testing and i input 12V (from table power supply) on input of the wire harness i measure the voltage on the output of the harness (where the LEDs would be connected) is ~10V(voltage drop across the resistor ?, and as the LED is in parallel, it receives the same voltage, correct ?). When installed in the car, when i turn on the lights without starting the motor (volatage ~12V), the LEDs are ok, no problem, but when i start the car (~14V) the LEDs are flickering, sometimes only one, sometimes both , sometimes very short, sometimes for few minutes, but after a while they stop flickering. What is causing this and what should i change to end the flickering, i suspect the resistor values have to be changed, but i would like some opinions for what value.
Long story:
i am currently in the process of changing the lights in my car from halogen to LED, because the better halogens i was buying (Philips RacingVision 150% H7) were only lasting very short time. I now bought Philips X-treme Ultinon 200% H7. When i fitted them in my car they were performing very well, no flashes from oncoming traffic, good cutout etc, but were giving an error in the car, that the bulbs are burned down (obviously because the LEDs are drawing much less power than halogens). My car has sensitive "bulb failure detection".
So obviously next step is to add some resistors to "fool" the car the halogens are still in place.
I have seen some already made harnesses selling on some shops, but the cabling was thin, without any protection, and the resistors were very small, and surely would get very hot.
So i created a wire harness myself.
I bought H7 sockets, cables, cable sleeves etc., big 200W 8R wirewound resistors, glue heatshrinks etc.
I created a harness, where the resistor is parallel to the LED bulb. As showed on the diagram.
When testing and i input 12V (from table power supply) on input of the wire harness i measure the voltage on the output of the harness (where the LEDs would be connected) is ~10V (voltage drop across the resistor ?, and as the LED is in parallel, it receives the same voltage, correct ?). When installed in the car, when i turn on the lights without starting the motor (voltage ~12V), the LEDs are ok, no problem, shining bright, no flickering but when i start the car (~14V) the LEDs are flickering, sometimes only one, sometimes both , sometimes very short, sometimes for few minutes, but after a while they stop flickering.
I was thinking it might be a voltage drop on resistor, so the LEDs are receiving toow low voltage to function properly, but why they are not flashing when light are on without motor/alternator running, but when motor is running they flicker.
They were functioning ok when connected directly without the resistor harness.
What is causing this and what should i change to end the flickering, i suspect the resistor values have to be changed, but i would like some opinions for what value.
short story:
I have a car light harness where i have added an 8Ohm wirewound 200W resistor parallel to the LEDs. When testing and i input 12V (from table power supply) on input of the wire harness i measure the voltage on the output of the harness (where the LEDs would be connected) is ~10V(voltage drop across the resistor ?, and as the LED is in parallel, it receives the same voltage, correct ?). When installed in the car, when i turn on the lights without starting the motor (volatage ~12V), the LEDs are ok, no problem, but when i start the car (~14V) the LEDs are flickering, sometimes only one, sometimes both , sometimes very short, sometimes for few minutes, but after a while they stop flickering. What is causing this and what should i change to end the flickering, i suspect the resistor values have to be changed, but i would like some opinions for what value.
Long story:
i am currently in the process of changing the lights in my car from halogen to LED, because the better halogens i was buying (Philips RacingVision 150% H7) were only lasting very short time. I now bought Philips X-treme Ultinon 200% H7. When i fitted them in my car they were performing very well, no flashes from oncoming traffic, good cutout etc, but were giving an error in the car, that the bulbs are burned down (obviously because the LEDs are drawing much less power than halogens). My car has sensitive "bulb failure detection".
So obviously next step is to add some resistors to "fool" the car the halogens are still in place.
I have seen some already made harnesses selling on some shops, but the cabling was thin, without any protection, and the resistors were very small, and surely would get very hot.
So i created a wire harness myself.
I bought H7 sockets, cables, cable sleeves etc., big 200W 8R wirewound resistors, glue heatshrinks etc.
I created a harness, where the resistor is parallel to the LED bulb. As showed on the diagram.
When testing and i input 12V (from table power supply) on input of the wire harness i measure the voltage on the output of the harness (where the LEDs would be connected) is ~10V (voltage drop across the resistor ?, and as the LED is in parallel, it receives the same voltage, correct ?). When installed in the car, when i turn on the lights without starting the motor (voltage ~12V), the LEDs are ok, no problem, shining bright, no flickering but when i start the car (~14V) the LEDs are flickering, sometimes only one, sometimes both , sometimes very short, sometimes for few minutes, but after a while they stop flickering.
I was thinking it might be a voltage drop on resistor, so the LEDs are receiving toow low voltage to function properly, but why they are not flashing when light are on without motor/alternator running, but when motor is running they flicker.
They were functioning ok when connected directly without the resistor harness.
What is causing this and what should i change to end the flickering, i suspect the resistor values have to be changed, but i would like some opinions for what value.