Negative battery cable - 2009 Audi A4 Quattro Cabriolet

Asked by 2bimmers Apr 25, 2018 at 11:03 AM about the 2009 Audi A4 2.0T quattro Cabriolet AWD

Question type: Maintenance & Repair

Changing the battery. What is the copper piece attached to the negative cable
(see photo)?  What does it do? What does it attach to? Please advise.
Thanks.

2 Answers
26,360

Jorge answered 6 years ago

Some car manufacturers add the copper piece as a safety measure for the ground wiring, some call it a sinking negative rail. It is attached to the negative (ground) terminal and should stay there. Simply replace the terminal with the copper piece the way it was.

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Deathjam4 answered 6 years ago

that picture makes it not even look like copper looks like regular steel to me :P if its not attaching or grounding to anything i would just pull it off. but i would imadgine it likely touchs the fire wall correct? clean the thing up and put it back the way it was at that point then.

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