Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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It sounds like you have a short in the wiring somewhere that is draining the battery when the machine is sitting. If both the battery and alternator are new then I would have the wiring checked closely for shorts or damage. The only other thing that could drain the battery like that is if the alternator were shorted out internally but you wouldn't think that it would be a problem since you have a new one on the machine. I would trace all the wiring and make sure that nothing is grounded out to the frame or that none of the wires have gotten hot and melted to each other which would cause the short. You could always check for a voltage draw on the battery when the machine is sitting and not running. If you have a volt meter you could attach it to the battery and watch the VDC while to machine is sitting to see if it is dropping, this would at least tell you that there is something draining the battery.
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