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chaffmj

Does motor have an alternator for charging?

9 posts in this topic

How can I tell if the motor I bought has an alternator ? It is a 1994 9.9hp Yamaha 4 stroke, electric start.

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If it's got factory electric start, it will have an alternator (or rectifier, technically, I believe).

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That's correct... some of the bigger motors DFI, 4 Stroke EFI (150 hp range and higher) actually run a alternator, but on smaller motors (like the subject motor) it runs a rectifier.

marine_man

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Ok so what you're telling me it does have a rectifer to charge the battery while running?

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Question, I have on older 35 Horse Johnson.. the motor is probably mid 80s.. it is a 2 stroke, but it is also an electric start. does my motor have an alternator in it? or does it do any sort of charging the battery when i'm driving(say over 1/2 throttle)??

thanks much

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If it came from the factory that way, then yes it should have a charging system.

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If you're unsure, use a multimeter to find the voltage prior to starting the engine, then measure it again at 1/2 throttle... you should see a increase in voltage

marine_man

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