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Charging system mystery

M

Mercman1230

New member
Engine: 50HP 2006 mercury outboard, 3 cylinder
Battery was not charging. With engine running, the output to battery was about 7VDC. Measured between one of the red wires coming from the regulator/rectifier and ground. The 2nd red wire was measuring 0VDC between it and ground. What does it do?

Output from stator, with engine running was about 20VAC, measured yellow wire to yellow wire. From what I understand that is lower than it should be, so I bought a brand new OEM stator and installed it. Cranked the engine and checked voltages, but none of the measured voltages significantly changed. I bought a new aftermarket rectifier/ regulator, and installed it. Once again, the output voltage to the battery stayed about the same 7-8 VDC at idle speed. As I understand it, the only major component of the charging system that has not been replaced is the flywheel. What’s the likelihood of weak magnets on the flywheel, being the culprit?
 
Actually, both red wires do connect back to the battery already. I read somewhere that the 2nd red wire might come into play when the engine is running at high rpms. It’s difficult for me to find good documentation on the details.
 
Can you point me to any documentation that tells me what it should be?
I can't recall the specific youtube video I saw, but someone was saying that the stator output should be 40VAC or more.
If 20VAC input = 7-8VDC output from the rectifier, then maybe 40VAC input to the rectifier would produce about 14-15VDC output, which is about where it should be. Any additional thoughts?
 
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