Fusion Wire Harness f/ MS-RA670 MS-RA770 Stereo - Zone 1 2 (B Port-RCA) [010-12812-01]Wire Harness Zone 1 & 2 (B Port RCA) Use this wiring loom to connect your compatible Fusion marine stereo to a Fusion marine amplifier, enabling the Zone 1 and 2 speaker or subwoofer zones. There are also RCA inputs for enabling the AUX 1 source. Compatible with MS RA670 MS RA770 MS WB670 MS WB675 MS BB100 MS RA210 MS RA70 WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or