I found the problem, i checked the power with a Fluke87III meter.
When the engine is off i get a nice clean 12v with a frequency 0HZ
When he engine is on i also get 12v but with a frequency of 80HZ
It's the design of the PWM, it uses the frequency to regulate the voltage.
Thats why the leds are flashing very fast, so the problem is in this case the led's power converter. (not stabalized)
It cannot handle this frequency, is any LED that don't have this problem?
Last edited by sandere; 07-14-2013 at 01:18 PM.