Totally agree and with 273. I just answered this, so excuse me if I am ranting. The headlights should be bright with the engine off (i.e. no alternator). If not, the path from the battery to the lights is bad. The only vehicle where revving the engine should affect the lights is a 1970's 2-stroke motorcycle that didn't have a battery. Your alternator's purpose is to recharge the battery, so if your battery isn't running down, yours is plenty big. Don't waste $170 on a new super one.
