Baffled by non charging Briggs

Standard mulitmeter with battery wire connected or disconnected same result. Even with no battery it should show a charge of about 14v dc.

NOT SO


Are you reading the battery voltage or using a ammeter to indicate charge?

What is the part number of the regulator you are using?
(reason I ask is this will tell us what charging system your engine is using)
and we can then give you some logical troubleshooting tips
 
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andrewslarge said:
How are you testing the DC voltage output?
Have you tried a new battery?
What is happening with a fully charged battery overnight and the engine is running?
You have the magnets, you checked the stator, you checked your cables/ground and you checked your voltage regulator?
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donslawns said:
I got this Troybilt in the shop that was not charging. Briggs 44H777-0116-E1. Stator output was 28vac, nothing out of the voltage regulator. I replaced the regulator. Still no output. Replaced it with another new regulator. Still no output. I start questioning my abilities. I pulled a known good regulator off of my own tractor. Still no output. Put it back on my tractor, charges fine. Check stator again, still 28vac. Again questioning my own abilities. Ran a ground wire from regulator direct to the battery - even though it was bolted to the metal air guide around the cylinder. Still no output. Ran another charge wire to the battery +, no change. Time to throw parts at it like a rookie. Put a new stator on it even though the stator appears to be good and even checked the magnets. No change. I am so ashamed. Anyone ever conquer a problem like this? I guess I could jack up the tractor and roll a new one underneath it and call it good,lol.
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Common testing standard: Most small engines are rated and tested at 3,600 RPM (no-load or governed speed). At this speed:Many Briggs & Stratton systems (e.g., 5A or 9A charging) produce ~28–40V AC (28V for smaller 5A systems, ~40V for 9A).
doityourself.com
Other common readings: 24–30V AC minimum, up to 40V+ AC depending on the stator.
lawnmowerforum.com
Higher-output stators (10–16A systems) may spec at least 20V AC minimum at 3,600 RPM across leads.
mytractorforum.com
Proportional to RPM: Voltage scales roughly linearly with engine speed (due to the permanent magnet flywheel and stator coils). Examples from testing guides:Around 16–20V AC per 1,000 RPM in some analogous small engine/magneto systems (though lawnmower values are often a bit lower per 1,000 RPM to hit the 28–40V range at 3,600).
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At lower speeds (e.g., 2,400 RPM), output drops significantly (e.g., ~2/3 of full value), which is why charging is poor at idle or low throttle.
 
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