Victory Lap GMA-05-R1 Alternator Rectifier All new parts of Original Equipment Manufacturer (OEM) specifications The rectifier does not often fail in the GM AD Series alternators, but when it does it usually results in low alternator out-put and must be replaced The GMA-05-R1 is the most commonly used rectifier in the GM AD series alts. Do not confuse it with the less popular, HD GMA-05-R2 rectifier that has a M8 x 1.25" battery terminal stud An economical, reasonable repair option New construction built to meet or exceed OEM specifications