Reverse polarity when connecting battery
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Newbie
Joined: Feb 2024
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Mercedes S550 W221
Reverse polarity when connecting battery
Title says it all, I was taking off the transmission and needed to provide a power source to rotate the driveshaft and I connected the battery with jumper cables and ended up making the cables hot and drained the battery, no more actions were made after, unsure which fuses to check or what to do.
Senior Member
Joined: Mar 2018
Posts: 493
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2006 W221 S500L M273
If the battery that was still in the car had some juice left, this may not be that bad.
How empty/dead was it?
What year is your S550? (your sig doesn't say)
Did you do it under the hood or in the trunk?
How empty/dead was it?
What year is your S550? (your sig doesn't say)
Did you do it under the hood or in the trunk?
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Joined: Aug 2014
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S500
check ALL pre-fuse boxes (probably blown them to hell) and buy a new alternator..... batteries probably hated it too - other stuff maybe properly muddled
easiest thing is to stop doing what some people mistakenly did in the 1970s - when they had half an excuse as positive earth cars where just getting old and previously dynamos didn't care... all of which meant things 55 years ago were still a bit odd
easiest thing is to stop doing what some people mistakenly did in the 1970s - when they had half an excuse as positive earth cars where just getting old and previously dynamos didn't care... all of which meant things 55 years ago were still a bit odd
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From: DFW
SL63
I thought I was careful before, when connecting a charger, or heaven forbid jump starting. I am going to be meticulously careful now.
Speaking of jump starting, there is a process called bump starting that is becoming an arcane art.
Speaking of jump starting, there is a process called bump starting that is becoming an arcane art.
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S500
BW35 had a front and rear pump and that auto could be bump started if you can get it above 20 mph - not aware of any other autos in the last 59 years than can do it !
https://archive.commercialmotor.com/...c-transmission
https://archive.commercialmotor.com/...c-transmission
Senior Member
Joined: Mar 2018
Posts: 493
Likes: 182
2006 W221 S500L M273
Replace rear battery.
Test front battery - replace only if it's bad
Check fuses as BOTUS said.
If car eventually runs, test alternator (voltage should be around 14V)
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From: Suburban Washington DC
1995 S280 5-speed
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1983 Nissan Shltbox
Yeah, total spammer. The bot is blasting me about my 1983 Nissan. Ignored.
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1983 Nissan Shltbox
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From: Phoenix
222 S-65
BW35 had a front and rear pump and that auto could be bump started if you can get it above 20 mph - not aware of any other autos in the last 59 years than can do it !
https://archive.commercialmotor.com/...c-transmission
https://archive.commercialmotor.com/...c-transmission
I got to deal with those decades ago in what were old Volvos. Definitely the bad old days.
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Joined: Nov 2016
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S-65 AMG
Title says it all, I was taking off the transmission and needed to provide a power source to rotate the driveshaft and I connected the battery with jumper cables and ended up making the cables hot and drained the battery, no more actions were made after, unsure which fuses to check or what to do.
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Joined: May 2017
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From: Las Vegas, NV
2014 C63 Coupe
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From: Suburban Washington DC
1995 S280 5-speed
Haha! Can't they just have something more obvious, like a "Report this Post" button? Anyway, already deleted the notification email, so how do I find the message? I don't see a MY MESSAGES link anywhere on the page.
