Mercury Marine is a division of Brunswick Corporation. | Yamaha. Info I have is model number: 15a51412fz and serial number: 1c012430. Merc 75. Controls you can always count on for two to six Mercury engines. I am sorry to say that when it comes to rigging with Mercury, there are too many variables that can lead us to give incorrect information. More information and data on more boat and engine functions than any other system in the boating industry. any help would be greatly appericted my friend. Based on the serial number you provided, the manufacture date for your motor is 05/03/1988.