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E24 (1976 - 1989)
The BMW 6 Series (E24) was the first variant of the 6 series produced by BMW from 1976 through 1989.

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  #1  
Old 06-12-2016, 01:14 AM
keith96 keith96 is offline
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smoking jumper cables, damage?

While away, someone tried to jump start my 85 635csi E24 and reported to me the cables were smoking. They swear they did not have them reversed however. The cables were not on for too long apparently.

Apart from frying any life in my existing battery, does anyone have some insight into what other problems I might encounter from this incident?

Thanks
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  #2  
Old 06-12-2016, 10:49 AM
dcains dcains is offline
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Hard to tell without having a look, but I'm going to bet the cables were reversed. First thing to be damaged is usually the OBC, so if that's gone, that will be your telltale. Might have also damaged the ECU and the alternator.
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  #3  
Old 06-12-2016, 03:06 PM
keith96 keith96 is offline
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Thanks Dean. It will give me a better picture when I approach this. I'll never let anyone else touch the car again, except the right mechanic.
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  #4  
Old 06-12-2016, 05:46 PM
dcains dcains is offline
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Best of luck with it. This happens because the BMW wiring color scheme has a brown ground cable and a black positive cable.
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Lutz, FL

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'87 Spider Veloce
'92 Spider Veloce
'08 350Z


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  #5  
Old 07-04-2016, 06:24 PM
keith96 keith96 is offline
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she fired right up with a new battery! now back to work.
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  #6  
Old 07-04-2016, 08:08 PM
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hornhospital hornhospital is offline
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You are incredibly lucky if the cables were cross-connected, but I believe that what really happened was the positive jumper cable was grounded on the car used to do the jump.
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Old 07-04-2016, 10:52 PM
dcains dcains is offline
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Quote:
Originally Posted by keith96 View Post
she fired right up with a new battery! now back to work.
Good for you. No damage to the OBC?
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'85 635 CSi Euro #9402254
'87 Spider Veloce
'92 Spider Veloce
'08 350Z


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  #8  
Old 07-04-2016, 11:37 PM
keith96 keith96 is offline
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nope. everything okay. very relieved. thanks for your input.
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  #9  
Old 08-09-2016, 12:17 PM
tommy335-635 tommy335-635 is offline
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Wow, that's a scary thought. You've got luck on your side
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