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So, is it going to cause problems if I run positive from radio to battery, negative from radio to firewall, and positive from amp to battery, negative from amp to body behind the seat?

 

to the original poster, we have a 2006 chevy HHR, with galaxy 959, plugged into the power port (cig lighter), and a 2 x 2879 box doing a little over 300 watts into a wilson 1000 mag mount. We have NO NOISE whatsoever, and have had NO issues with interfering with the car's electronics.