Help! I got a new battery because the mower would no longer start. It died gradually during one morning of starting and stopping. I had the old battery tested = dead. But when I hooked up my new battery, I instantly got a whirring sound that did not stop until I disconnected the battery cable. If I turn the key, nothing happens. It seems like the problem has to be electrical, but I'm not sure where to look next. Thanks in advance.
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