Can an alternator deliver partial charging or is it an all or nothing thing. Have port engine that’s not quite putting out 14v and trying to determine a starting point for trouble shooting. Is it fairl easy to test engine output at the engine?
13.2v - 14.4v is just fine. Could be a variety of things from bad grounds to weak batteries.
Get yourself a Yamaha service manual and follow the instructions on how to test the charging system. But again, if it doesn’t drop below 13.2v you’re charging just fine.
YOU MUST HAVE A DVA ADAPTER TO TEST THE CHARGING COMPONENETS
IF YOU HAVE 13 VOLTS, YOU ARE FUNCTIONING PROPERLY
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Thanks for the replies.