Regulator voltage

[Arkus55]

I have a B&S Vanguard engine 356776-3046-G1. It is installed on an old Scag SWZ 52" walk behind, pull start. I am having problems with the PTO clutch engagement. The PTO would engage at first. But if it was hot and shut off, it wouldn't engage again. Then it stopped working all together. I checked the air gap of the PTO and the ohms reading is within limits. At full throttle, the voltage coming from the stator is 38V ac. The output voltage is only 6-7V dc. I replaced the regulator/rectifier with the same outcome, somewhere aroung 8V dc. Am I missing something? I have double checked the grounds, etc. Again, this is a non-battery system. So there isn't any back voltage requirements that I can find.

 

[bertsmobile1]

Where is the voltage regulator connected to the engine ?

 

[Arkus55]

Where is the voltage regulator connected to the engine ?

The regulator is bolted directly to the engine. The input comes from the alternator.

 

[ILENGINE]

That engine calls for the 845907 regulator. Unless they changed something from they previous superceded part numbers that regulator is for the electric start engines which would need to supply 12v to the regulator to make it work.

 

[Hammermechanicman]

ILengine is correct. You need a battery to make the charging system work properly

 

[ILENGINE]

ILengine is correct. You need a battery to make the charging system work properly

And the regulator in the OP picture is not the regulator that Briggs says fits that engine. That engine even has a different stator to regulator connection than Briggs claims. Looks like the 794360 regulator with the tri circuit stator. Not the 10-16 amp stator as what Briggs says fits the OP engine. Maybe something is wrong with the OP model-type number.

 

[Arkus55]

The regulator is bolted directly to the engine. The input comes from the alternator.

And the regulator in the OP picture is not the regulator that Briggs says fits that engine. That engine even has a different stator to regulator connection than Briggs claims. Looks like the 794360 regulator with the tri circuit stator. Not the 10-16 amp stator as what Briggs says fits the OP engine. Maybe something is wrong with the OP model-type number.

Yes, either the tri circuit or 9 amp regulated stator. That’s the question/issue. I can’t find anything about testing this circuit without a battery. I have verified the model number (see attached). But this system worked, until it didn’t. So trying to figure out the problem. My son just bought this a month ago and I don’t have any experience with this type of mower.

 

[Hammermechanicman]

Appears that engine came with 3 different stators and regulators.

 

[StarTech]

IL go to the Power Portal, part of the specs says tri-circuit stator setup. Then the stator is listed as a tri circuit in the IPL but then they list the 10-16 regulator. They are not compatiable. Looks to me like some mis-info provided in the IPL.


If the most of info provided is correct then the OP has the tri-circuit setup.

 

[22R]

My Kohler had a bad engine electrical connector that caused the same symptoms. The output wire of the Regulator going back to key switch the terminal connector was degrading. New connector and all good. may not be your issue but just another idea to check.

22R