Is this extra ground cable from battery-to-chassis, a good idea? Or is just completely unnecessary or dangerous?
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It won’t hurt anything and could actually help if the original cable is corroded, which is likely after 23 years.
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ok, thanks, I will jst leave it as it is
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Is there an aftermarket stereo system in the car?
That’s one of the “big three” wires people usually upgrade when trying to get maximum power with a mostly stock electrical system.
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Yes, pretty much right, There’s a Pioneer stereo installed in this car.
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what of the Amplifiers???
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I’m not that quite sure if there are amplifiers installed in this car, only but for the aftermarket Pioneer stereo unit.
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This vehicle likely benefits from an extra ground. Make sure to scrape the paint off the grounding points. 
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Dude that’s for an MK3 with a DPS6 you’re like 11 years too soon.
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my bad, next time maybe lol. 