Briggs dual circuit alternator overcharging??

cbs123

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May 26, 2020
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Hey guys, I've got a briggs intek 17.5 hp engine on a Troy Bilt rider. I've had two batteries go bad on it. So, while testing the charging system, I found it to be charging, but it got to over 16 volts after cutting with it for awhile! It was around 16.5 or even a little higher!

It's possible that while I was testing it, I cleaned some corrosion from the connector on the alternator, but also thinking it may actually be overcharging the battery and causing damage to the battery. I did test the red wire (one with the diode) and only got around 13 to 14 volts DC at 3,600 rpms. Which is kinda strange, since the battery got all the way up to 16.5V dc

Any ideas? Is that much voltage normal from these dual circuit alternators?
 
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