New SAE J1171 Marine Certified Alternator Fits Mercruiser PCM Pleasurecraft OMC Inboard V8 I/O V6 Replaces OEM Mando & Motorola This replacement is desirable for both economic and reliability reasons. Units W/ External Regulator are Obsolete Red lead Battery Sense - Purple or Black lead Ignition - Complies to SAE J1171 Certification - Exceptional Quality for the Price Design Based On MANDO Internal Regulator / External Fan ** See Product Description for Fitment Chart **