I recently rewired my ghetto 2-switches-in-the-console-for-headlights to work with the stock switches for headlights/hibeams. Along the way I discovered a problem.
I noticed that if I follow the wiring diagram on my car, my "high beams" are significantly lower in brightness than my Low beams.
I verified the issue with beam pattern. On low beams there is a distinct cut off line, along with a brighter beam, however on High beams, there is a wide beam pattern that is very dim.
Note: The bulbs are three prong, common, hi, lo. I wired the bulbs to be 12v positive on the hi and lo, and grounded the common. The factory does it the oposite, where the lights get the power from the common, and the hi, lo are switched to ground.
Could that be part of the problem? As far as I know, light bulbs work exactly the same if you run the current the other way.
-Oliver