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    Mercury 500 bogging down and dying under load?

    Hey guys I just took my boat out for the first time since I got it. It's a 1965 alumacraft 16ft. Anyways it has a 1973 Mercury 500 thunderbolt ignition 50hp. So it seemed to be running just fine crusing around the lake , but it was super slow almost like it had a govener on or something. So I...
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    1973 Mercury 500 thunderbolt questions?

    Was wondering does this motor have a alternator or charging system? I want to put a little stereo in my boat but don't wanna drain my battery. Also wanna make sure it's charged up.
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    What's my merc year?

    How to find out what year my motor is. I have searched everywhere online and can't find anything. Serial #3720242 it's a 500 thunderbolt ignition 50hp 4cyl 2stroke
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