My experience? Today's simple replacement halogen lamps don't overload the wiring but if you replace the highbeams with some expensive highpower bulbs, you must use a relay to power them. I found out the hard way when the 66 300's headlight switch overloaded and left me in the dark until I switched to the oem low beams and the lights came on again.
Larry Jett I think I will just put an "out-of-order" sticker on my forehead and call it a day.