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Why does 15hp briggs engine quit running when disconnected from the battery

Battery is not being charged and when I disconnect battery the engine dies. I ran a wire directly from the mag to the battery and it continues to run but still only get about 12.7 volts to the battery. Is that sufficient to keep the battery charged or do I need more volts.

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Are you sure that the specific gravity of the battery is reading correctly,it it is reading low or it could be that your battery is sulfated .Did you have a battery tender on it during the Winter months,assuming you have Winter where you live? If the battery shows signs of swelling or slight roundness on its' sides it is usually a sign that you need a new battery.As for the mag ,sounds as though it is delivering enough voltage to do the job so my best answer for you would be pull battery,bring it to automotive center like Auto Zone or Advanced or maybe you have a Sears close by,have them check it with a load test.

Posted on Apr 19, 2014


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Intake and exhaust valves need adjustment. Intake .004, exhaust .012.
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