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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Cosmetic and Lighting Modifications (exterior & interior) > Is this the negative battery cable in the trunk?
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      12-19-2015, 01:59 PM   #1

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Is this the negative battery cable in the trunk?

Hi guys,

I'm trying to disconnect the ground negative battery in the trunk of my 2015 m235i. The battery is not stationed on the right hand side of the trunk but rather where flat tires are at.

Anyways, I tried disconnecting the black cable that my finger's pointing at using a 10mm socket, and it created sparks as I was pulling the cable...

To my knowledge, ground isn't supposed to create sparks as it's not "hot", am I getting the correct ground cable?

Can anyone please tell me where the ground cable is?

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      12-21-2015, 10:20 PM   #2
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That's the right cable but you are disconnecting it at the wrong place. It's normal for it to spark a bit when you are disconnecting it.

When you loosen the 10mm nut at the battery terminal, you can simply pull out the terminal with minimal spark. In your case, you are loosening a nut that is allowing play between the body of the car, the negative terminal and the 10mm nut causing it to spark while you are unscrewing it.

Disconnect it at battery terminal first, not at that grounding point. After you disconnect it at terminal, re tighten the grounding point you were trying to remove.

Hope that helps!
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