Quote:
Originally Posted by 340man
I was not expecting to see so many components. I don't have a clue as to how it works.
Most likely failure though is one of the electrolytic capacitors, about 27 years old now.
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it is a Pulse Width Modulation circuit , It switches the headlamps on and off rapidly about 100 times a second , the ratio of ON to OFF is what determines the brightness , it can be adjusted slightly with the Potentiometer inside .