Help! I charged my R350 with front cigarette lighter and now the car won’t start
Thread Starter
Newbie
Joined: Nov 2022
Posts: 4
Likes: 2
From: Toronto
R350 BT
Help! I charged my R350 with front cigarette lighter and now the car won’t start
Hi All. I made a mistake by trying to trickle charging my car through the front ashtray lighter.
The car won’t unlock or recognize both keys.
I used the manual key to enter which sets the alarm off.
Is there a way to fix this? Any help is appreciated.
The car won’t unlock or recognize both keys.
I used the manual key to enter which sets the alarm off.
Is there a way to fix this? Any help is appreciated.
Junior Member
Joined: Jan 2016
Posts: 65
Likes: 4
2008 R500 5.5 l
Why a mistake?
I just bought such a charger last week and had the intention to also trickle charge my class R this way. Should I not..? Did you find out that our R are not compatible with these chargers?
I just bought such a charger last week and had the intention to also trickle charge my class R this way. Should I not..? Did you find out that our R are not compatible with these chargers?
Super Member
Joined: Nov 2017
Posts: 558
Likes: 114
From: San Francisco Bay Area
2006 R500
I don't think any of the 12v ports are of the "always on" variety. This would mean that you could inadvertently power systems that shouldn't be receiving power when off, and without a battery to buffer it, can cause voltage spikes that can damage computers.
Super Member
Joined: Jul 2009
Posts: 938
Likes: 53
From: Montreal, Canada
2005 C240 2011 R350
This isn't the 1970s, Every device is controlled by a SAM.
Besides, even if there was a direct line between the lighter and battery, it would most likely be off when you remove the keys.
Honest, been driving and fixing cars for 45 years and never dreamed of charging via the cigar lighter.
Just did a google search and there is just so much misleading information on this subject. Sad.
Besides, even if there was a direct line between the lighter and battery, it would most likely be off when you remove the keys.
Honest, been driving and fixing cars for 45 years and never dreamed of charging via the cigar lighter.
Just did a google search and there is just so much misleading information on this subject. Sad.
Super Member
Joined: Nov 2017
Posts: 558
Likes: 114
From: San Francisco Bay Area
2006 R500
This isn't the 1970s, Every device is controlled by a SAM.
Besides, even if there was a direct line between the lighter and battery, it would most likely be off when you remove the keys.
Honest, been driving and fixing cars for 45 years and never dreamed of charging via the cigar lighter.
Just did a google search and there is just so much misleading information on this subject. Sad.
Besides, even if there was a direct line between the lighter and battery, it would most likely be off when you remove the keys.
Honest, been driving and fixing cars for 45 years and never dreamed of charging via the cigar lighter.
Just did a google search and there is just so much misleading information on this subject. Sad.
If you want to wire in a standby charger on the R class, you'll need to wire a direct line from the battery/fuse box underneath the passenger seat, the fusebox in the spare tire compartment on the main positive terminal, or the jumper locations under the hood.
Thread Starter
Newbie
Joined: Nov 2022
Posts: 4
Likes: 2
From: Toronto
R350 BT
DO NOT charge your MB using the front cigarette lighter!
Somehow the Cigarette Lighter Charger, drained my Car battery to the point where I had to manually open my doors with the key. Due to the drained car battery, the car wouldn’t recognize the keys or start.
By charging the car using the Red (+) Post and the (-) Body Post in the engine compartment I was able to start the vehicle. I took it for a long drive and all seems fine now. Hopefully the battery isn’t damaged. The vehicle seems fine now.
I did a bit of research and it seems that I could have charged the R350 with the 12V outlet in the trunk.
Lesson learned. From now on, I will only set up a trickle charger to the engine compartment (+) and ( - )
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Junior Member
Joined: Jan 2016
Posts: 65
Likes: 4
2008 R500 5.5 l
Thank you a bunch guys, you saved my battery as I was about to do the same mistake. I feel very lucky coming across your post by pure chance. Glad to know your battery seems to have survived for now.
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Thread Starter
Newbie
Joined: Nov 2022
Posts: 4
Likes: 2
From: Toronto
R350 BT
After Effects
So I did a disconnect of my battery to rest the computer systems and it seems that everything except for my battery is ok. Maybe it’s a coincidence that my batter is old and needs replacement.
Lesson Learned. 🤦🏻♂️
Lesson Learned. 🤦🏻♂️
Thread Starter
Newbie
Joined: Nov 2022
Posts: 4
Likes: 2
From: Toronto
R350 BT
Quick Update
Here’s a quick update.
My battery was actually damaged from charging through the cigarette lighter and had to be replaced. Luckily there was no other damage to the vehicle.
lesson learned.
My battery was actually damaged from charging through the cigarette lighter and had to be replaced. Luckily there was no other damage to the vehicle.
lesson learned.
DO NOT charge your R350 with the front cigarette lighter plug.
Somehow the Cigarette Lighter Charger, drained my Car battery to the point where I had to manually open my doors with the key. Due to the drained car battery, the car wouldn’t recognize the keys or start.
By charging the car using the Red (+) Post and the (-) Body Post in the engine compartment I was able to start the vehicle. I took it for a long drive and all seems fine now. Hopefully the battery isn’t damaged. The vehicle seems fine now.
I did a bit of research and it seems that I could have charged the R350 with the 12V outlet in the trunk.
Lesson learned. From now on, I will only set up a trickle charger to the engine compartment (+) and ( - )
Somehow the Cigarette Lighter Charger, drained my Car battery to the point where I had to manually open my doors with the key. Due to the drained car battery, the car wouldn’t recognize the keys or start.
By charging the car using the Red (+) Post and the (-) Body Post in the engine compartment I was able to start the vehicle. I took it for a long drive and all seems fine now. Hopefully the battery isn’t damaged. The vehicle seems fine now.
I did a bit of research and it seems that I could have charged the R350 with the 12V outlet in the trunk.
Lesson learned. From now on, I will only set up a trickle charger to the engine compartment (+) and ( - )
