View Full Version : Charging system help

03-03-2012, 07:11 PM
I have a 5-7 yr rider with a 17.5 B&S. Last season I replaced the battery in the mower, started and ran fine, after a couple hours of use the battery was dead again when I went to start it again (Just jumped it the rest of the season). So obviously there is a charging problem. I have checked the wiring (ground, fuses) and no obvious damage. Now I'm thinking the diode or stator. What is the best way to proceed with diagnosing my issue. It has two wires coming from the stator with an in-line diode above a two-pole connector.
Any help would be appreciated.

03-03-2012, 09:34 PM
Well first get a wiring diagram of the mower and the engine. That helps out a lot of times. I really can't help you out anymore. Other then looking for any broken, disconnected, or two wires touching and shorting out.

03-03-2012, 09:48 PM
Disconnect the stator from the tractor harness, Set a multimeter to DC volts scale, Hook the black test lead to any good ground and the red to the stator wire with the diode. Start the engine and give it full throttle then read voltage out-put.

Engine model AND type numbers along with color of stator wires AND plastic connector plug would be helpful.

Tractor brand and model numbers could be handy as well....


03-03-2012, 09:54 PM
I had a friend, on his the electric clutch was bad. Caused to much of a drain.

03-04-2012, 06:27 PM
I checked the DC volts off the stator...18 after the diode.
The engine info is:
B&S 17.5 I/C OHV
model 31c707-0603 e1

Sorry I don't have the mower model info....my computer is at a different place than the mower. It is a Troybilt with "Pony" on the side. 42" deck.

It has two wires total off the stator
one red with the diode
and one black

I also checked the battery
12.5 not running
started and full throttle gradually climbed from 12.5 to 16 before I shut it off as this seemed really high?
Could it be over-charging and boiling the battery and that is what is causing the batteries to fail? If so what is the fix?

03-05-2012, 03:58 PM
Here is the mower info. and manual.
model 13AN77TG766


From what I can tell this mower/engine combo does not use a regulator?
So am I down to changing the diode (harness).

03-05-2012, 10:11 PM
I will check the lawn mower out tomorrow b/c I didn't really see any electrical at all in the parts diagrams.
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03-06-2012, 11:14 AM
Check out the Multimeter Manual section here:http://www.mymowerparts.com/pdf/Briggs-&-Stratton-Spec-Charts/