is this for a sound system or what? ground wires are easy: you have one big wire going from your negative post to a good slab of (unpainted) metal on the chassis. (the motor should also have grounding to the chassis). Anything that you need to "ground out" you just bolt to the chassis. When you are talking about sound systems, you need to consider how much current you want to draw. that will determine the diameter of wire you'll need.
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