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Hello Mario. My name is Tan.
The alternator for this engine is a kit that actually goes under the flywheel. Here is the part number for the kit 3GR-06128-0. You will also need a Charge rectifier kit 3GR-76160-0
Here is a link to the alternator kit. http://www.tohatsu.us/index.php?main_page=product_info&cPath=1&products_id=111350&gclid=Cj0KEQjwnIm7BRDSs42KxLS8-6YBEiQAfDWP6HT_SooAy_wzPeB3LrHgqklhBsr3juLIuGe4T1CHq4UaAv-18P8HAQ
Here is the rectifier kit. https://www.tohatsu.us/index.php?main_page=advanced_search_result&search_in_description=1&zenid=i6ci8p0f19640ouj3ciahl59s2&keyword=3GR-76160-0&x=10&y=7
Installation instructions come with the kit.
Here is the listing from Tohatsu for electrical kits. http://www.nissanoutboardparts.com/Electrical-Kits.html
Post back with questions.
Your engine should have an alternator on it already. The parts manual shows the alternator # ***** and the rectifier # ***** http://www.boats.net/parts/search/Nissan/Outboard/2013/NSF6C/MAGNETO/parts.html