chaffmj Posted August 19, 2009 Share Posted August 19, 2009 How can I tell if the motor I bought has an alternator ? It is a 1994 9.9hp Yamaha 4 stroke, electric start. Quote Link to comment Share on other sites More sharing options...
Ralph Wiggum Posted August 19, 2009 Share Posted August 19, 2009 If it's got factory electric start, it will have an alternator (or rectifier, technically, I believe). Quote Link to comment Share on other sites More sharing options...
marine_man Posted August 19, 2009 Share Posted August 19, 2009 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 Quote Link to comment Share on other sites More sharing options...
chaffmj Posted August 19, 2009 Author Share Posted August 19, 2009 Ok so what you're telling me it does have a rectifer to charge the battery while running? Quote Link to comment Share on other sites More sharing options...
marine_man Posted August 19, 2009 Share Posted August 19, 2009 If it has electric start it does.marine_man Quote Link to comment Share on other sites More sharing options...
chaffmj Posted August 19, 2009 Author Share Posted August 19, 2009 Great I was hoping it did. Quote Link to comment Share on other sites More sharing options...
jwmiller33 Posted August 21, 2009 Share Posted August 21, 2009 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 Quote Link to comment Share on other sites More sharing options...
boatfixer Posted August 21, 2009 Share Posted August 21, 2009 If it came from the factory that way, then yes it should have a charging system. Quote Link to comment Share on other sites More sharing options...
marine_man Posted August 21, 2009 Share Posted August 21, 2009 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 voltagemarine_man Quote Link to comment Share on other sites More sharing options...
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