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It depends on where you install the amp. If it's in the trunk, you can find grounding points underneath the carpeting or up on the rear deck.
 

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Theres a factory nut in the trunk floor that is unused. I think it takes either a 5mm or 6mm metric thread bolt (you must supply this). I used this point as my ground. Just grind off the paint and bolt down your ground wire, coat the finished install with dielectric grease or spray paint it to protect it from corrosion.

 
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