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Y2K SL500 Silver
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Discussion Starter #1 (Edited)
Much has been written about whether or not to Jump Start a R129 dead battery. The owners manual says to follow the M-B procedure

Remember to have the Ignition Key in position 0 , and connect the Negative (-) terminal last before attempting to start the car.

Many M-B mechanics will tell you that they have done a lot of work on cars that have been jump started incorrectly and this has ended up costing the owner big bucks for the replacement of such electrical components as the ECU, etc., please see http://www.benzworld.org/forums/2144209-post10.html and http://www.benzworld.org/forums/2355578-post10.html and http://www.benzworld.org/forums/1950209-post11.html and http://www.benzworld.org/forums/r129-sl-class/1376562-90-sl300-soft-top-problems-2.html#post3064964

Note: The battery is located on the right side of your trunk and there are Service Mechanics that have suggested that you put a piece of Duct Tape on your battery with a label that says, "Do not Jump Start or Charge this battery without first contacting the owner." or utilize a 12 Volt Antizap Surge Protector
 

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1995 sl 500 red/black w/renntech wheels
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686 Posts
Look i do it the simple way just like old times , no book , no dealer . I usually just hook it up to another car while the other car is off , and start your dead car.If that doesn't work i start the car , then start the dead car. I really dont read any instructions which is a bad thing , but im like screw it . And it works every time.
 

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Sl500 1997
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215 Posts
lynns said:
Much has been written about weather or not to Jump Start a R129 dead battery. The owners manual says to follow the M-B procedure, please see http://www.benzworld.org/forums/2371141-post7.html

Many M-B mechanics will tell you that they have done a lot of work on cars that have been jump started and this has ended up costing the owner big bucks for the replacement of such electrical components as the ECU, etc., please see http://www.benzworld.org/forums/2144209-post10.html

Note: The battery is located on the right side of your trunk and there are Service Mechanics that have suggested that you put a piece of Duct Tape on your battery with a label that says, "Do not Jump, Charge, etc. this battery without contacting the owner."

I'm of the opinion that if you are in the U.S. why not utilize "free" M-B Roadside Assistance, please see http://www.benzworld.org/forums/2046809-post1.html
My advice.
key off
remove battery
charge it and if needed buy another one at MB dealer
Insert battery back
Start car

If start car with low battery or connected with another car
many errors will be written in memory of the car
possible hardtop problem
EGS
key
I hade a lot of errors at my car just by low battery :)

Rgds
 

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96 SL500, 97 E420,
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1,098 Posts
For those who don't drive their sl's everday, you may want to invest in a battery charger and leave it on 2 amp/volt trickle charge so you'll avoid any problems from frying the electronics from a jump.
 

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Y2K SL500 Silver
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8,660 Posts
Discussion Starter #5 (Edited)
Battery Tender products

gqmagic said:
For those who don't drive their sl's everday, you may want to invest in a battery charger and leave it on 2 amp/volt trickle charge so you'll avoid any problems from frying the electronics from a jump.
I would like to here from the R129 electronics guru "bobterry99" with regard to the Battery Tender products such as Batterytender.com - Home of All Your Charging Needs Battery Tender Jr.
 

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As most of you know by now, I have been dealing with "dead battery" symptom for quite a bit lately. I have jumped using another car, Road Side Assistance, etc. So far the car when jump started, demonstrates no ill effects. I have a hard time believing our car is that fragile. Yes, its an expensive toy. Fragile, hardly.

Use your common sense when jumping; connect cable with both cars not running. Start the "jump car" first. Let it charges the battery for a while, then start the SL. That's how I have been doing.

Will my luck runs out? Time will tell.
 

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1990 500SL
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71 Posts
elau said:
As most of you know by now, I have been dealing with "dead battery" symptom for quite a bit lately. I have jumped using another car, Road Side Assistance, etc. So far the car when jump started, demonstrates no ill effects. I have a hard time believing our car is that fragile. Yes, its an expensive toy. Fragile, hardly.

Use your common sense when jumping; connect cable with both cars not running. Start the "jump car" first. Let it charges the battery for a while, then start the SL. That's how I have been doing.

Will my luck runs out? Time will tell.
That is my experience as well and my mechanics who are most knowledgable about these things see no problems with this method either using the above common sense approach.
 

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Outstanding Contributor
'03 SL500, '03 SL55, '97 SL320, (2) '91 300SL, (2) '91 500SL, '00 S500 -- all for sale
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lynns said:
I would like to here from the R129 electronics guru "bobterry99" with regard to the Battery Tender products such as Batterytender.com - Home of All Your Charging Needs Battery Tender Jr.
I think this product will work perfectly well for keeping a battery fully charged. However, I imagine your owner manual states that you should only connect a charging device with the battery disconnected from the car.

By the way, I have jumped R129s many times without consequence. Maybe it is key that you connect the cable to the negatives last and disconnect it first or that you have both cars off when making connections.
 

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2001 SL500 / 2004 Dodge Ram 3500 HO CTD / 2010 Subaru Outback
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313 Posts
Very interesting. This 'fleece' battery sounds a lot like the AGM (absorbed glass mat) batteries that are used quite often in high-end boats and RVs ... they offer lots of advantages in mobile environments due to their sealed design and tolerance for motion but tend to be expensive. Since my SL is a 2001 I'll have to run down to the garage and see if this is how my car is equipped ...

Cheers,

Stuart
 

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2000 Obsidian Black Metallic Mercedes SL 320 V6
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4,527 Posts
I'm not sure about my SL but most likely it's what I have but I'm 100% sure about my Yamaha YZF - R1.

Cheers.
 

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trickle charger

I have a permanent trickle charger in my trunk ..secured and connected to the battery .I just plug an extension cord in now and then and its perfect .
I also use this device for trickle charging in the winter when in storage .
Spend $50 and sleep well at night :)
 
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