ANYFISH2 Posted May 10, 2009 Share Posted May 10, 2009 I have a 04 115 Yamaha 4 stroke. I had batteries(2) run dead on opener. After jump starting engine to get back to access we checked fuses and any wiring for problems and found none. We did however find that after starting with a fresh battery that when we removed the cables that the motor would die immediatly. This telling us that the charging system of the motor appears to be failing. Am i correct with this thought?Also does anyone know if the Alternator is bulit into the starter? Or is it in a different location? Any help would be greatly appreciated, thanks. Quote Link to comment Share on other sites More sharing options...
boatfixer Posted May 11, 2009 Share Posted May 11, 2009 Welcome to FMThe alternator is under the flywheel. Disconnecting the battery while running is never a good idea. If you have access to a volt meter try hooking that up to the battery and watch the voltage as you increase rpm's. Since you checked for the obvious, you could have a bad stator or rectifier. Quote Link to comment Share on other sites More sharing options...
ANYFISH2 Posted May 11, 2009 Author Share Posted May 11, 2009 Thanks for the welcome, I was here before as ANYFISH but apparently was unable to get a new password.Wouldn't usually take cables off. Just tried to transfer from a good battery to the boats batteries to try to charge but that didn't happen.How do I check the stator/rectifier? location of both would help also. Quote Link to comment Share on other sites More sharing options...
marine_man Posted May 11, 2009 Share Posted May 11, 2009 Have you validated this:If you have access to a volt meter try hooking that up to the battery and watch the voltage as you increase rpm's.marine_man Quote Link to comment Share on other sites More sharing options...
ANYFISH2 Posted May 11, 2009 Author Share Posted May 11, 2009 Had a mechanic look at it this morning, and the volts rose from 12.23 to 14.8. So he said the charging system appears to be fine, two new batteries problem should be fixed. Thanks guys Quote Link to comment Share on other sites More sharing options...
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