Pony battery not charging

Hello all,

I've determined that the battery won't charge after replacing it. If I jump start the Pony, it runs forever, until I shut it off.

I've googled this topic and found general instructions, such as using a voltmeter to test AC and DC output from the alternator, etc., but can't find anything specific to my model. I did find the fuse under the battery, and it's good, clean, and tight.

I found a large and small connector by the engine. One has two tires (red, orange) which then go into the large connector (red, orange, black, and grey). I tested the voltage of each of these against ground, but wasn't sure which was AC or DC. Here's what I found with the engine running at about 3/4 throttle:

Orange: 13.9 VAC
Red: 13.8VDC, also reads 18.6 VAC
Black: 22 VDC
Grey: 14.0 VDC

I also looked for the infamous regulator or diode, but could not find either.

Can anyone make sense of this, and suggest what could be wrong, and how to fix it?

BTW, Pony model 13WM77KS011, Briggs model 31R7 07 001 G1

Thanks for listening.

Well what you have posted proves you have absolutely no idea.
So lets start with something simple.
Take a DC reading between the battery posts engine stopped.
Start the engine, let it run for a minute or so at FULL Speed and take another reading
Post what you found.
While you are there multimeter in hand take an AC reading as well.
AC should be 0 DC should be >12V engine off & >13 V engine running.
If your mower has an electric PTO take a third battery reading engine running full speed and PTO running.
It should also be better than 13 V DC.

Hi Bertsmobile1,

Thanks for the analysis and reply. Will check it this weekend and post.

bertsmobile1 said:

Well what you have posted proves you have absolutely no idea.
So lets start with something simple.
Take a DC reading between the battery posts engine stopped.
Start the engine, let it run for a minute or so at FULL Speed and take another reading
Post what you found.
While you are there multimeter in hand take an AC reading as well.
AC should be 0 DC should be >12V engine off & >13 V engine running.
If your mower has an electric PTO take a third battery reading engine running full speed and PTO running.
It should also be better than 13 V DC.

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