As I get some noise in the Empeg when I turn on my headlights, I searched around the web, and I found the following:

NOTE: Pulse Width Modulated headlight switches (like some Honds cars use) can cause a whining type of noise when on, verify this type of problem by turning lights on and off while listening for noise. If this is the problem, the headlight switch may need to be replaced with an alternate type.

Anyone who can explain PWM, and why it is used for lights??

TommyE