You had your tractor keyed on using booster cables and getting spark when touching cable to ground might mean you are completing the circuit.... As was said, check your ground cable as well as double check your work on the wiring you did back in spring.
It could be regulator...do make sure it is grounded.
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Two 125's and a 124 all with 42" decks
Plow blade
#2 Cart
QA36 snowthower
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