Brand new in box, never mounted. Either with single or dual 1/2” pulley. Please specify your choice. Balmar's 1/2" Deep “V” Pulleys (single and dual) can also accept 3/8" and 7/16" belts. 12 Volt DC, Output: 70 Amp. Includes Internal Voltage Regulator and short harness where one can plug in external regulator of your choosing. Alternator is a “P” type. Mounting Type is Saddle (Dual Foot). Saddle Size: 3.15" mount is found on Yanmar as well as Mercruiser, Lehman, Perkins-Sabre and Hitachi equipped engines and many more. 3.15" is the internal dimension between the two mounting feet. Alternator features dual fan, one on front of the rotor and other in rear for superior cooling. Maximum RPM 12,000. Using alternator Temperature sensor is highly recommended (optional) unless one has very small battery bank. Can be bench tested to show it is working right in front of your eyes. Notification required to set-up testing.