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run an 18g wire from the source unit to the ground on the amplifier. This will prevent 90% of all noise by bringing ground potential to the same point. Engine noise happens in only a few instances...radiated noise or ground loop. Ground loop comes from different ground potential (different resistance to ground, since nothing is 100% efficient). Radiated noise is a different animal altogether.
I always, without exception, run a ground wire between the source unit and the amplifier.
When you ground the amplifier, run the ground directly to the battery. The is the most effective way to ground, and keeps you from having to drill another hole in your car.
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