I have a 27 HP. 2 cylinder Kohler engine on a generator with a heavy 12 
volt marine battery. On starting this relatively small engine, the 
voltage drops to 9 volts at the battery!

Mark E. Skeels wrote:
> I don't know what current ought to be with a working system, but I will 
> measure the battery voltage under load and see if (how much) it drops.......
>
> Mark E. Skeels wrote:
>   
>> I measured the voltage from + battery term to + starter motor; then 
>> minus battery term to - starter motor, and added.
>>
>> It's a new lead/acid lawn mower battery. The wires were original and 
>> getting warm, so I surmise current is probably OK......
>>
>> Mark
>>
>> Dr Skip wrote:
>>   
>>     
>>> How did you measure the drop? My first guess would be sulphated battery
>>> not able to provide enough current. I might also try heavy gauge wires
>>> direct from a known good (or even oversized) battery to motor, both +
>>> and - .  If still no turn, then it's the motor. If it works that way, go
>>> huntin' some more.
>>> -Skip
>>>
>>>   
>>>     
>>>       
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