RB Alternator Charge Cable - Wiring Specialties RB20 RB25 RB26 Wiring Specialties PRO Charge Cable; Product Description. The Wiring Specialties Alternator Charge Cables are designed for a DIRECT connection between the starter and the alternator. By utilizing a high temp 6 AWG wire, it allows for much higher current carrying capacity than the factory charge cable. This is perfect for engine