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What happens if someone wrongly fix the battery for Toyota corolla, i.e negative to positive
 

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2015 4 Runner SR5
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Welcome to the site KingRight.

I moved your post here to the general Corolla section. If you tell us the year we can move it to that specific area.

The answer to your question is - it depends. You may blow the main fuse, you may blow other fuses or do some damage to the computer. Or if you are lucky nothing bad happens. If the car stops running or you get some odd behavior or error codes after you can work on figuring those issues out.
 
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