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I have an Intek 24hp that started to suffer from flat batteries. I checked the DC voltage from the regulator which was 0v. I also checked the AC voltage at full revs which was 20v.
I know I need a new regulator but wondered if the 20v AC was sufficient? The manual says it should be 28v AC

28V AC gives you 14V DC which is what the battery charge rate should be about. So 20V AC is only putting out 10V DC to the battery. Something to make sure is that you are getting battery voltage to the regulator. Without at least 9-10 volts input will not turn on the regulator to output voltage. Also make sure to make sure the regulator is grounded otherwise it won't work either.

Whoa wait a minute...We need to know which stator the OP has as there is 10 and 13 amp versions that has a 20 vac output. Need picture of the stator.

IL what you are thinking about is the half wave rectified systems and not the full wave rectified systems.

Thanks for the replies guys.
The engine model is the 445677 if that helps identify which stator I have?

Well need to get it a little closer than that.

Just been to check details on the rocker cover ...
My typo, actually a Model 446677, Type 0463 E1, Code 050630YG

Okay that engine has two different stators listed. Do you have a one wire or two wire version?

I suspect you have a two wire version which is the 10-13 amp version due flywheel magnet size.

It has two yellow wires coming out of it.
Which would suggest from your diagram in a previous post that 20v AC is satisfactory?

Because Briggs buy their alternator stators in, they have so many it is not funny
They use a colour coding system applied to the wires and the plugs
So we know you have yellow wires what we need to know is the colour & shape of the plug that the wires from the stator go into .
After that the other factor is the magnet size
Briggs put out This ID chart a long while ago

Yes. As the flywheel probably has the small magnets and that stator outputs 10-13 amps. PN 696458 for stator.

Thanks very much for that guys.
Well, it's definitely 10A or it's definitely 16A! 10A means an output voltage of 20v AC, and 16A means an output voltage of 30v AC.
I'm getting 20v AC on full throttle which if correct would suggest I have the 10A system. However, if it's the 16A system then I have a problem.
Could a faulty stator throw out 20v instead of 30v? or would it be all or nothing?
As you can guess I'm trying to establish the situation without having to pull more of it apart to measeure the magnet size to determine what I have.

Sounds like you could have lost some magnets......

Maybe it's too late to answer your last question, but a faulty stator can throw out even 15v instead of 30v. I think the best solution would be to replace it and don't waste any time repairing it. It's pretty expensive and will barely work. Instead, I suggest you replace it with the new one. And moreover, you may need a manual motor protector to prevent such situations in the future. I think MSSP1 would be a great choice, at least I've been using it for several months, and it works perfectly.