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I am ***** *****. I have a 91 BMW 850 with a dead battery.

Customer Question
I am ***** *****....
I am ***** *****. I have a 91 BMW 850 with a dead battery. this car has 2 batteries in the trunk and one is new and the other is apparently dead. I can't get the trunk open because a servo that is powered by the dead battery is not working. How do can I get the trunk open to replace the bad battery, if the bad battery controls the survo to open the trunk?
JA: Thanks. Can you give me any more details about your issue?
Customer: I am looking for an alternative way to get power to the trunk servo. I can't get enough power from the dead battery to do it.
JA: OK got it. Last thing — BMW Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.Category: BMW
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Answered in 27 minutes by:
3/30/2016
BMW Mechanic: Matt, Engineer replied 1 year ago
Matt
Matt, Engineer
Category: BMW
Satisfied Customers: 22,157
Experience: Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
Verified

Hello

I'd start by charging the battery you should be able to do this via the cigarette lighter / accessory socket. You'll need the appropriate attachment for your charger but car accessory shops sell these- Alternatively if you can't get into the car/ boot the other way to do this is jack the car up so you can get under the front.

Locate the starter motor and the large power cable that runs to it - connect the positive battery charger lead to this terminal

then connect the charger negative lead to the metal of the engine block

This should complete the charging circuit and get some power into the battery allowing you into the car

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BMW Mechanic: Matt, Engineer replied 1 year ago

Hi

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