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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > Sparks When Reconnecting Negative Terminal?
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      10-05-2017, 08:50 PM   #1
Kailec
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Sparks When Reconnecting Negative Terminal?

Hey guys, when I disconnected the negative battery terminal in the trunk everything was fine, but when I reconnected it there was sparks. Is this normal or a sign of something dangerous?
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      10-05-2017, 09:24 PM   #2
F30RiK
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      10-07-2017, 12:30 PM   #3
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Yup it?s normal. Happens on all cars when using jumper cables or reconnecting battery cables.
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      10-07-2017, 02:43 PM   #4
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It means that something was turned on when you reconnected the terminal. That's to be expected. It's pretty much impossible for everything in the car to be turned off by any means other than disconnecting the battery. That's why sometimes the battery has to be disconnected.
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