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hooked the battery in backwards

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Friend w/an Ariens ztr w/15hp Kohler Command hooked his battery in backwards (+ cable to - post) to start spring mowing. Wouldn't start so he jumped it by placing the + jumper on the solenoid starter side and - jumper to a lift point on the engine. Heard a loud pop and then nothing. Discovered his mistake. He found a 30a fuse blown so replaced it after he swapped the battery cables to the correct post. He still has nothing. I am betting he fried the solenoid but any other thoughts?

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Check for any other fuses and check the voltage regulator(if applicable). The solenoid would likely not have sustained much damage because the current in question is the same whichever way its going through it. The starter however would be another matter if the bendix decided to jam downward. Do a hot lead(jumper cable) touch on the starter in the proper polarity to check the starter, then check the solenoid by jumping the terminals. If it passes, the problem is in the controls/switches/fuses side of things.

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