18 HP B&S Charging System

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GoHardrGoHome

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I have a 18 HP (M/N 422447 Type 1216 01 Code 90121132) Briggs & Stratton engine on a Grasshopper riding mower with a charging system issue. Note that this stator is the single-wire version. I had to replace the diode in the harness due to damage. Got one from a local B&S dealer that lasted a couple weeks. Went to another more reputable dealer for another...same result. They seem to rectify the AC voltage (~28 vAC) to ~14 vDC current for a short time and then the meter readings are jumping all over the place. I've had it with the diode system! Can someone tell me if I can put a regulator rectifier in the system in place of the diode? If so, what is the P/N for the regulator rectifier? FYI, I ordered from Amazon what I thought would be the correct unit but it is for a 2-wire stator, so I don't think I can make this work without burning something up!
 
I suspect that if someone knew the specs of the diode I need, I would put it in and forget about it. B&S lists the diode as part of the stator wiring and doesn't provide the specs on the diode. The dealerships I've dealt with, suspected they were giving me the correct diode. I think not.
 

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If your tester is reading 28V AC off the stator, your peak voltage is 40V each direction. The diode will have to take that voltage, and whatever peak current the stator can push into the battery - could be pretty large.
 
Great pic. In future posts start with that. We need engine and mower numbers to help.

Still I can't pull it up on the Briggs site.
 
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