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5 Ground Lead (Black) (Sold Separately) Connect this lead securely to a clean, bare metal spot on the vehicle's chassis. Verify this point to be a true ground by checking for continuity between that point and the negative (–) terminal of the vehicle's battery. Ground all your audio components to the same point on the chassis to prevent ground loops. 6 Insulation Tube 7 Speaker Input Leads These leads are input leads for use with head units not equipped with preamp outputs. When not using the RCA