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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 08-27-2010, 08:48 AM   #1 (permalink)
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Quick question: Do I need to cut off battery when working on head/tail lights?

As title. Thanks a lot.
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Old 08-27-2010, 09:44 AM   #2 (permalink)
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Also, if I cut off battery negative end, is there any I will miss after it is restored? For example: if you take off the battery of an AUDI, the radio will be locked after the battery is put on again. A radio code will be needed to unlock the radio which could cost $120 if car is taken to a dealer.

Just want to make sure nothing will miss after battery is taken off.

Thanks.
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Old 08-27-2010, 12:33 PM   #3 (permalink)
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It depends on what you are doing. If it is just replacing light bulbs, there is no need. But for any job, if I were you, I rather pull the fuses out for the tail lights so that I don't mess the radio.
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Old 08-27-2010, 01:02 PM   #4 (permalink)
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Yea, it's a good idea. Thanks.

Quote:
Originally Posted by leadfoot View Post
It depends on what you are doing. If it is just replacing light bulbs, there is no need. But for any job, if I were you, I rather pull the fuses out for the tail lights so that I don't mess the radio.
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Old 08-27-2010, 05:42 PM   #5 (permalink)
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You will be fine. I rarely unhook the battery anymore, I used to think the same that I could damage things, but if you aren't turning the lights on, hitting the brake pedal, etc you aren't applying voltage while you are working on the lights.
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Old 08-27-2010, 10:18 PM   #6 (permalink)
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Even though I spray electric cleaner on the socket?
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