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I have 2 craftsman lawn tractors they both have 15.5 hp

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hi i have 2 craftsman...
hi i have 2 craftsman lawn tractors they both have 15.5 hp briggs and stratton engines they both have a dual circuit alternator, my problem is when the tractor is running at full rpm for 20 min or so the battery voltage goes up to 20 v dc, i know this isnt normal, i even changed multimeters to make sure. i dont get why it charging so high.
Submitted: 1 year ago.Category: Small Engine
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Answered in 3 hours by:
5/9/2016
Technician: JohnF2015, Technician replied 1 year ago
JohnF2015
JohnF2015, Technician
Category: Small Engine
Satisfied Customers: 1,155
Experience: Owner/Service Technician at S & J Small Engines
Verified
Hi, my name is***** will be assisting you.Does your engine or machine have a regulator on it? If so the regulator is most likely your issue, it is causing voltage spikes which it should not be doing. I have seen this happen on several occasions and normally replacing the regulator will solve your issue. The only other thing that I have seen occur is the wiring from the alternator get shorted together and cause it.
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Customer reply replied 1 year ago
nope they do not have any voltage regulators
the wiring was all checked and so was the fuse and holder
Technician: JohnF2015, Technician replied 1 year ago
The wiring under the flywheel coming off of the stator or alternator was checked as well?
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Customer reply replied 1 year ago
yes it was i removed the flywheel and checked everything everything is good
Customer reply replied 1 year ago
08 May 2016 09:14
yes it was i removed the flywheel and checked everything everything is good
Customer reply replied 1 year ago
now today i have rechecked after 20 min of running and its at 16.2 volts
Technician: JohnF2015, Technician replied 1 year ago
Can you provide the model and type numbers from your engine so that I can look at diagrams of the engine to better assist you?Does the battery get warm or hot after running the machine for a little while? If it is overcharged normally the battery will get hot.
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Customer reply replied 1 year ago
the engine model is 31c707 0230 e1 030625za
the second one is 31a607 0741 b2 100216zdthe batterie does not get hot at all even at 20 volts it dint get hot, batteries arent boiling either
starting to think this is normal for these thats probably why batteries dont last very long in lawn tractors.
Technician: JohnF2015, Technician replied 1 year ago
According to the parts diagram for the 31c707 it has a voltage regulator on it. I would suspect that the regulator is bad if you are getting that kind of charging voltage back to the battery. It should normally be somewhere between 14 - 15 volts.And the 31a607 also shows to have a voltage regulator as well in the parts diagram.They both utilize the dual circuit stator or alternator.
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Customer reply replied 1 year ago
where is this regulator located cause ive searched the entire tractor inside of frame and evrything
Technician: JohnF2015, Technician replied 1 year ago
The regulators are normally mounted right to the side of the engine. The wiring from the alternator(normally yellow wires) plugs into it and then there will be another wire(normally red wire) running from it back to the solenoid or ignition switch. It is a square block about 2".
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Customer reply replied 1 year ago
checked again today there is none, the 2 wires comming from the stator are red and one is black, the red one has a diode in it and the black one is pure ac for lights, both wires go into the harness and go to the ignition switch.
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