Chava,

If LO beam is the two outside lights and HI beam is all the lights, what lights flicker and go out on HI? If there was a thermal overload located in the headlight switch, ALL the lights would flicker and go out.

When the lights are on HI beam, and all the lamps are illuminated as Bill in indicates, and the problem happens, do just the inside lights flicker and go out? This would mean it is indeed in the circuit from dimmer to headlights...wouldn't it!

Does this make sense?

Stuart