Posted by 2underage on May 15, 2017 at 04:20:34 from (64.19.81.130):
In Reply to: Re: John Deere 40 S posted by erohn65 on May 15, 2017 at 03:38:54:
Reversing the polarity will not cause the battery to explode. More likely the damage was caused when someone tried to boost the tractor with a 12 volt battery and did not make a tight connection which caused a spark and WHAMMOOO. Also, there are no sensitive electronics on that old JD 40 that would be harmed by reversing the polarity but, yes, the amp meter will read backwards which is why the meter jumped to a positive when you turned the lights on.
Just change the ground from negative to positive on the battery and you should be good to go.
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