Ummm, Sun auto suggests what is basically a daisy chain for their grounding kits - which looks like what you have setup. You're probably introducing a ground loop in your electrical system. Find some installation examples online and use them. You'll probably have luck installing it like the Evo guys do.
Please tell me you at least have a ohm-meter/multimeter if you're messing with your car's electrical system... Your problem could just be a bad connection somewhere. You need to check every point where electrical components ground themselves for continuity to your battery ground.
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