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Then the whole vehicle is a ground loop since most things are grounded to the battery or the frame and the battery itself is grounded to the frame.  In a vehicle where ground is a common shared thing it would seem a loop would be impossible to avoid.


Your drawing also suggest a base station install.  A vehicle is not a base station install, if so where do you suggest I put the grounding rod?



The persons problem is with stray RF.  I have my equipment installed with the help of people who have been running heat for a long time and have no problems. 


Keep grounds as short as possible.

Ground everything well.

Use braided grounding strap for body and frame grounds.

Keep the amp as far away from other electronics in the vehicle.  The trunk or cargo are is the best place.

Use good quality cable 6 gauge or better for amp power and ground.