Why is the light intensity on headlights pulsating??

[Paul G]

Let me try to remember this problem, it's been years ago. I believe the alternator has diodes in it. Diodes change the A/C current in the alternator to DC battery current. If a diode fails it will be passing a chopped DC in to the electrical system. If the pulsing lights varies with engine speed it is the diodes in the alternator. That is if I remember this problem correctly.

[mysil bergsprekken]

Thanks Paul. Yeah the diodes might have something to do with it. But remember in my case the lights pulsate at an even throttle. So they dont pulsate more at 5k rmp than they do on 2,5k rpms.