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Ck out voltage regulator & stator in a briggs & stratton engine

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Posted on May 17, 2017


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There are two yellow wires and 1 red wire on a voltage regulator on a Briggs and Stratton 22hp. The the mower flooded recently.

the two yellows go under the flywheel to the stator , they are a/c current that is converted to 13.8 volts D/C in the voltage regulator .I would not think it being under water would hurt the stator or regulator . Maybe the mud under the flywheel might grind things.

Aug 27, 2016 | John Deere Riding Lawn Mower. EZtrak Z425...

1 Answer

Briggs & Stratton engine model # 4455770435E1, need to find out what part number to order to fix alternator? Told our "stater" was bad?

The alternator (P/N 592831) should put out around13-14 volts DC with no load (other than charging the battery. If the voltage drops only when the deck is engaged but not when the lights are on it could be a connection to the mower clutch causing excessive current draw. I suggest covering the fundamentals such as ensure the battery is healthy, ensure all connections are clean and tight before condemning the stator. then and only then would I remove the flywheel to inspect the stator.

Aug 16, 2014 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

Where is the stator located

Hi, Thanks for your Question. My name is Kevin and I will try and provide a solution to your question.
Your Husqvarna is equipped with a Briggs and Stratton engine. The Stator acts as an alternator to provide power to keep the battery charged after passing through a rectifier/voltage regulator which converts the A/C current generated by the stator into D/C current regulated to approximately 13.8 volts.
The stator is located beneath the flywheel at the top of the engine. Keeping in mind that it is extremely rare for a stator to fail, it should be tested to verify it is malfunctioning. This can by done very easily with a voltage meter set to measure AC voltage at the plug prior to the regulator. Once verified that it is defective, the following procedure will provide access to the stator.

Remove the top engine cover via loosening the four bolts, two in front and two near the rear of the engine. You will also need to remove the fuel pump from the cover and removing the dipstick support fastener. Once the cover is off, remove the bolt from the crankshaft located in the center of the flywheel. You will need to use something to hold the flywheel so it does not turn as you remove the bolt. A large screwdriver placed into the cast iron section of the flywheel will work fine. After the bolt is removed, you will need to use a flywheel puller to remove the it from the tapered crankshaft. A puller can be purchased at auto parts store such as Napa or an online site such as Amazon ( HERE is the LINK to order )
Briggs Stratton 19203 Flywheel Puller

The stator may now be removed via three or four fasteners and the new one installed. It is very important to use a torque wrench to tighten the flywheel so as to not crack the flywheel nor damage the bolt or crankshaft.
I hope this helps. If you have any clarification feel free to ask. You may wish to bring the machine to a qualified repair shop to properly test the stator and replace if needed. Labor should be no more than one or two hours.


Jul 11, 2014 | Husqvarna Lawn Tractor 48" Deck, 23 Hp,...

1 Answer

Which part of the bike charges the battery cntinue when start

The voltage regulator changes the ac voltage from the stator to dc voltage to keep the battery charging while the engine is running.

Sep 02, 2013 | Briggs & Stratton LawnBoy 20Inch 65 HP Gas...

1 Answer

17 hp briggs stratton

Hello there. My name is George. In regards to your problem, there are a few things you need to know. Make sure both battery cables and post are clean and tight. Also check the two bolts holding the voltage regulator onto the side of the engine. A loose voltage regulator will not have the proper grounding to function. Underneath the flywheel is a device called an stator. This stator creates an alternating current or commonly called A/C Voltage. This voltage travels to another external device called an Voltage Regulator. The voltage regulator converts the A/C voltage from the stator to Direct Current or commonly called D/C Voltage to the units battery. Using the Model, Type and Code numbers found on the valve cover, you can call any parts store and they should be able to tell you what type of charging system you have, (i,e. 10 amp, 20 amp etc.) Ask them what the A/C voltage should be coming from the stator. I believe it will be at least 28 to 30 volts a/c. You can measure this voltage by using an ohm meter set to a/c~volts. You must have the engine running full throttle when you do this test. The ideal rpms for this test is 3600.
You would need an tachometer to get it perfect, but full throttle usually gives an a/c output around 28 vac Now with the stator and voltage regulator disconnected and the engine running at full throttle, use the red and black test leads from the ohm meter and put the tips into the wire connector, red on one wire and black on the other. No, it does not make a difference which wire. Read the meter. If it shows the voltage the parts store told you (around 28vac is my guess, then your stator is doing its job. If it is giving you anything less than that the stator is bad. If it is bad, you will need to remove the flywheel to inspect it and or replace it. If its good, Turn off the engine and reconnect the stator and voltage regulator. Now find the single wire coming from the voltage regulator (its normally red) and disconnect it. This wire is the d/c voltage connection going to your battery. Set your ohm meter to d/c volts. Start the engine and let it run full throttle while you put the red test lead into the red wire coming from the voltage regulator and the black to a good ground. If you cant find a good ground then use the negative -(Black) battery post. If you read around 13 to 14 volts d/c then your voltage regulator is good and you have a shorted wire from the voltage regulator to the battery, If its bad then it will read 0 and it will need to be replaced. Feel free to contact me at: if you have any other questions. Good Luck.

Aug 20, 2013 | Briggs & Stratton Garden

1 Answer

Starting problem

the blades stop when there isnt enough power to engage electric clutch sounds like a charging issue when the engine is running place a voltmeter to the battery there should be over 13 volts if not replace voltage regulator if that doesnt work replace stator

Jul 19, 2012 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

MTD yard Machine lawnmower,17hp Briggs And Stratton engine. Runs for about 15 or 20 minutes and stalls. It will not start again until I recharge the battery over night. Then only runs again for 15 or 20...

yes it could be

check your battery 1st , then check the stator a/c output

• 10 or 16 Amps DC regulated for charging
• Two black leads (C) from stator
• Yellow connector (D) with two pin
• Two yellow leads (E) to regulator-rectifier
• One red lead (B) from regulator-rectifier
to red connector output lead (A)
• 10 and 16 Amp systems use the same
stator, color coding and regulator-rectifier
• Alternator output is determined by the
flywheel alternator magnet size

The stator and regulator-rectifier are the same
for the 10 and 16 Amp systems. The system
output is determined by the flywheel magnet
Test Alternator Output
1. Temporarily disconnect stator wire
harness from the regulator-rectifier.
2. Insert RED test lead (A, Figure 28) into the
V ω receptacle in the meter.
3. Insert BLACK test lead (B) into COM
4. Rotate selector to AC Volts position.
5. Insert RED (A) and BLACK (B) test lead
probes into output terminals (D & E) in
YELLOW connector (C). (Test clip leads
may be attached to either terminal).
6. With the engine running at 3600 rpm, the
output should be no less than:
• 20 volts - 10 Amp System
• 30 volts - 16 Amp System
7. If No or Low output is found, check for
bare wires or other defects. If wiring
defects are not found, replace the stator.
voltage depending on alternator type and magnet size

then check the regulator / rectifier , make sure it is grounded properly

make sure battery earth lead is good

i suspect loss of bat voltage is letting the afterfire solenoid close off the main jet

let me know model and type codes off engine & i will try help further


Aug 29, 2010 | Briggs & Stratton Garden

2 Answers

I have a Briggs & Stratton Generator 5550Watt model 030253 That is showing an output of only 4.6 Volts at the pannel. Suggestions???

Check to see if this unit has brushes and rings. If it does, then make sure that the brushes are making a good contact on the rings. If the contact is good, then your voltage regulator could be bad. This would require more troubleshooting.

May 04, 2009 | Briggs & Stratton Power Products 5,550...

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