E30 Amp ground cable?

[AndrewBird]

Either that or sand the paint off the car near the amp and ground it there. Depends on where you have it mounted though. You might also have ground loop problems like this, but I've seen many do it this way.

[netcsk]

The same spot that the battery grounds is the best spot.

[slap2nd]

Where is the best place on the E30 to wire the ground cable to?

I seem to be loosing power from my sound system and for some reason I think its not grounded correctly.

Help would be greatly appreciated.

Thanks.