Alternator Booster Harness – RX7 FD3S  / RX7 FC S5 Compatible
Give your RX-7 the charging support it needs with this drop-in alternator booster harness, designed for both FD3S RX-7 and S5 FC RX-7 models. This simple mod improves charging performance at idle by adding a diode to the alternator circuit — no splicing, no mess.
Perfect for builds running electric fans, upgraded lights, audio systems, or ECUs that demand steady voltage.