Well, considering I installed everything myself, and no noise was present, I'm about 110% I did everything right. I didn't say caps would prevent engine noise. I was trying to say by not using them, your causing excessive drain on battery which causes the alternator to kick out juice that it's not meant to be kicking out. And yes, that can lead to noise. About the grounds. The correct way to ground is to ground each component separately. At least, that's the way we did it when I worked at Car Tronics out there in Rivergate.
