Upgrade your S4 FC RX-7's charging system with this adapter harness, designed to seamlessly integrate an FD alternator into your setup. Crafted for a clean, plug-and-play installation, this harness eliminates the need for splicing or guesswork.
 
Why Choose the Boosted Option?
The boosted version includes a carefully selected diode that improves charging voltage at idle—perfect for builds running electric fans, upgraded lighting, audio systems, or ECUs that demand steady voltage.