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  1. #1
    New Member tpolley's Avatar
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    Mar 2009
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    Default riding lawn mower lights

    why is it that all the lights on my riding mower go dim when i idle the engine and get brighter as i increase the throttle? are they not hooked to the battery?? are they hooked directly to the magneto or whatever and not run off the battery at all?

  2. #2
    Platinum Member
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    May 2007
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    846
    Location
    eastern PA-lower Poconos
    Tractor
    JD2320 w/R4 $21,100 w/7.16%off

    Default Re: riding lawn mower lights

    That use to be a common problem with cars before they switched from generators to alternators. Probably your battery is marginal or your voltage regulator is set low.
    Eastern PA -JD2320 w/R4; 200CX w/61" bucket & Markham toothbar or JD adj forks; 46BH w/16", Imatch, ballast box & York rake-blade-scarifer, 54" front plow and trailer receiver. Case 580K w/fel+bh, mule 610XC

  3. #3
    New Member tpolley's Avatar
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    Default Re: riding lawn mower lights

    it's got a new battery as of last month.

  4. #4
    Veteran Member jwstewar's Avatar
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    Sep 2001
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    2,290
    Location
    South Central Ohio
    Tractor
    2003 New Holland TC24D

    Default Re: riding lawn mower lights

    Most of the new riding lawn mowers I've been around don't run the lights off the battery. They run them off the generator/starter on the engine. Should the engine stall for a reason, the lights will go out completely.
    Jim
    New Holland TC24D

  5. #5
    Gold Member shot_gun's Avatar
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    Mar 2008
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    386
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    NJ

    Default Re: riding lawn mower lights

    Your tractor uses a combination of stator/ battery to operate the lights. When your idleing the battery is suppling the voltage for the lights. When you rev up the engine than the stator picks up the slack giving the necessary voltage to give you bright lights. You machine probably still has the 3 amp stator which in later models they changed to 15 amp to handle the electrical loads. If you run your tractor at idle long enough with the lights on eventually the battery will go dead. It's an annoying problem but it is what it is. Hope that helps alittle.
    S_G

    Remember nobody ever complained about having too much horsepower!

  6. #6
    Silver Member
    Join Date
    Jul 2006
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    219
    Location
    Pittsburgh, Pa
    Tractor
    Chinese quality - Jinma 2420 - Ford 1900 - Steiner 420

    Default Re: riding lawn mower lights

    On a lot of these cheap mowers you have two circuits in there. One is only for the headlights and the other is a charging circuit for the battery. Not sure what the purpose of that is. But I would imagine its due to not needing a voltage regulator then. And most charging circuits on mowers are just for a trickle charge of the battery it doesn't actually charge like a car or battery charger can.

    Steve

  7. #7
    Super Star Member
    Join Date
    Oct 2004
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    16,854
    Location
    First organized permanent settlement in the northwest territory
    Tractor
    2003 Kubota BX1500/2004 Kubota Bx23/2005 Kubota BX1500

    Default Re: riding lawn mower lights

    Quote Originally Posted by tpolley View Post
    why is it that all the lights on my riding mower go dim when i idle the engine and get brighter as i increase the throttle? are they not hooked to the battery?? are they hooked directly to the magneto or whatever and not run off the battery at all?
    Rite.
    Most of the box store tractors work like that.
    work like that I believe..
    Tractors 2003 Kubota BX1500 / 2004 Kubota Bx23 / 2005 Kubota BX1500.
    Attachments 60'' Front Blade/48'' Rear Tiller/FEL/Back Hoe /
    60'' MMM/Clamp on Forks/48'' MMM
    South of Canton Ohio L .B

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