Battery problem

Discussion in 'Mechanic and Repair' started by dogthenine, May 7, 2007.

  1. dogthenine

    dogthenine LawnSite Member
    Posts: 7

    I am having a battery (charging) problem. I was having to charge/jump-off my lawnmower (Murry with briggs and stratton engine) everytime I used it. Anyway, I bought a new battery a 1.5 weeks ago, and the lawnmower started right up. I used it for one day, and it sat for 9 days. Today, I went to start it and it wouldn't start. The starter will turn the motor over (slowly) a time or two and then stop at the bottom of the stroke. (like a weak battery). But when I jump it off it will turn over until it starts. What is my problem? Is it the Stator?

    Thanks,
    dogthenine
     
  2. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 923

  3. dogthenine

    dogthenine LawnSite Member
    Posts: 7

    By "jumping-off" I mean I am using my battery charger's 100A engine start mode hooked to the Positve and Negitve terminals on the battery.

    Engine model--28N707

    Is this what you are refering to?
     
  4. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 923

    "Is this what you are refering to?"

    Yes to both, I didn't know if the Murray was the jumper or the jumpee:)

    Do you have a voltmeter? Even a cheap one From Radio Shack can be handy.

    Look at the wires coming out from the alternator/shroud.
    How many and what color are they?
    Ditto the the wires from the connector to the rest of the tractor.
     
  5. dogthenine

    dogthenine LawnSite Member
    Posts: 7


    I do not have a voltmeter.
    The wires comming out of the shroud are red and black. There are three wires going to the rest of the tractor--red, white, and black (which goes to the starter).
     
  6. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 923

    From your description-
    This is something somebody sent me a long time ago-

    This is a dual circuit Stator 3 AMP DC unregulated, 5 AMP AC, (this is the only unit that runs AC out to the lights) with the diode for the DC at the connector, this stator uses a black and red wire from under the flywheel to a white connector then the wires change to red (DC) and white (AC), the diode is encased in the connector they say.

    If this description is correct, your headlights would only operate when the motor is running.
    If this is correct, do they operate now? IF not, I'd say the stator is probably toast!

    Rig up a 12V test light (tail light type bulb) with a couple clip on leads.
    Hook it up to the battery with engine running & not running. Is there a difference in brightness?
    If there is, it would appear the system is charging.
    IF not-
    Unplug connector.
    Jumper test light from RED wire from stator & ground. If it is charging, the light should be on when running. If it is on then, but doesn't get brighter in the first test, the diode is probably bad (or bad connection)
     
  7. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 923

    Sorry double post
     
  8. dogthenine

    dogthenine LawnSite Member
    Posts: 7


    Well, first off, my headlights are not plugged up, because the tabs on the plastic lenses broke and the headlights won't stay in now . So, I just removed them. If I understand what you said, then I could hook a light up to the headlight plug. If the stator is working, it should light up. If it doesn't, then the stator is shot. Is this right?
     
  9. Bill Kapaun

    Bill Kapaun LawnSite Senior Member
    Posts: 923

    A VERY VERY good indicator.
    The R&B wires coming from the stator are AC up to the connector.
    The white wire is just an extension of one of the wires coming from the stator, probably the RED one.
    It "T"'s off to the headlights (white) AND to the diode (in the connector) to make a "rudimentary" DC for the battery.

    I would ASSume you don't have an electric PTO clutch, since 3 Amps wouldn't power it.
     
  10. dogthenine

    dogthenine LawnSite Member
    Posts: 7



    I will try it this afternoon, and post results. Since I don't know what an electric PTO clutch is, I am sure I don't have it. :dancing:
    Thanks for the help so far!
     

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