C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Crossed terminals HELP!!!

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Old Dec 21, 2017 | 11:56 AM
  #1  
Ryan May's Avatar
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c230
Crossed terminals HELP!!!

I woke up early in the morning and my car needed to be jumped. I used my roommates car to jump it and wasn’t paying attention. After about 30 seconds I noticed i places the jumper cables on the wrong terminals, who could blame me it was early in the morning and Mercedes made both cables black. After I corrected the mistake and jumped my car I noticed that all of my headlights except for the left high beam do not work. What’s weird is when I set the lights to auto, the right headlight will flicker on and off for a couple of minutes then not work at all. The only way I can drive at night is with my left high beam on. Any suggestion what it could possibly be?!?
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Old Dec 21, 2017 | 03:29 PM
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2005 C230K SS
Originally Posted by Ryan May
I woke up early in the morning and my car needed to be jumped. I used my roommates car to jump it and wasn’t paying attention. After about 30 seconds I noticed i places the jumper cables on the wrong terminals, who could blame me it was early in the morning and Mercedes made both cables black. After I corrected the mistake and jumped my car I noticed that all of my headlights except for the left high beam do not work. What’s weird is when I set the lights to auto, the right headlight will flicker on and off for a couple of minutes then not work at all. The only way I can drive at night is with my left high beam on. Any suggestion what it could possibly be?!?
You obviously fried something in the front SAM
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Old Dec 22, 2017 | 10:52 AM
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You obviously fried something in the front SAM
most likely the headlight ballast. I never jump my MB. Disconnect the battery and charge it.
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Old Dec 24, 2017 | 01:21 AM
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Do the low beam headlights "work" (flickering or whatever) when switched to ON?

Do you have halogens or HIDs?
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Old Dec 26, 2017 | 03:19 AM
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not a merc
Forget what lamps are fitted, your SAM is damaged for sure!
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Old Dec 26, 2017 | 10:35 AM
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Originally Posted by Russell Ormerod
Forget what lamps are fitted, your SAM is damaged for sure!
How do you figure. I have see anywhere from nothing happening to ecus fry.
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Old Dec 26, 2017 | 05:20 PM
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I figure because I work on these cars daily and the output stages are easily damaged from jump starting and especially reverse polarity.
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Old Dec 27, 2017 | 08:31 AM
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Originally Posted by Russell Ormerod
I figure because I work on these cars daily and the output stages are easily damaged from jump starting and especially reverse polarity.
You just very mater of fact about it and I dont think it is that simple. Sure if you just want to shotgun parts at the thing you should replace the sam without any diagnostic. Sure would be a shame though if it was just a a ballast that cost half as much.
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Old Dec 27, 2017 | 09:34 AM
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I agree with you, diagnostics comes first and that's what he needs to do, but talking from experience front and rear Sam's Die from voltage transients.
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