since the new battery has been put into place, the dimming is gone. . . .but I'm waiting for the chipping effect to take place, where you beat down a battery over a while and then eventually the battery will not be able to hold a charge as well. . . .the alternator at idle does dip, but the minute I hit the gas, the voltage recovers. . . .if you have the opportunity to get a yellow top, I'd pair it with a HO alternator right off the bat ANYDAY. . . .