How to jump start?

[beastia]

Hello my friends
i have a new question
My SL stayed on the garage at week and battery lost all power.
i opened hood and doesn`t look contacts for cables for jump starting
Wheres these contacts?

[RedLiner]

Originally Posted by beastia

Hello my friends
i have a new question
My SL stayed on the garage at week and battery lost all power.
i opened hood and doesn`t look contacts for cables for jump starting
Wheres these contacts?

The battery is in the trunk/boot

BE CAREFUL with jump starting it can apparently cause many problems.

[beastia]

the problem is it
car stay at small garage box front side to garage door
Near trunk no place

[BANANA]

Push the car out. try not to jump start the car because i am told by my mercedes dealer if you jump the car you might blow the ecu or the soft top control unit, or the roll bar control unit. i have jump started sl's in the past and luckily i have not had any problems. to be on the safe side either charge your battery or put a new one in. the battery is in the boot of the car.
good luck.

[wayneg]

I have been advised by a Mercedes specialist UNDER NO CIRCUMSTANCES JUMP START A R129 or any modern Merc. You might be lucky and get away with it or you could fry any of the ECU`s. Your choice. I have gone to the extreme of labeling the battery and the boot lip saying "Dont Jump this vehicle".
Disconnect the battery located in the rear R/H wing and charge it up. Many owners use a trickle charger to keep the battery charged if leaving the car for some time.

[ErikFinn]

Originally Posted by wayneg

UNDER NO CIRCUMSTANCES JUMP START A R129 or any modern Merc.

I agree. A friend of mine apparently fried the instrument cluster, so there a lot of things that can go wrong. Safest way would be to remove the battery and charge it or replace it. You'll need to enter the radio code after the battery is removed. On newer models one may additionally need to have the dealer clear some fault codes after the battery is removed, but this is far more safer and cheaper than frying some components.

[lynns]

Please read http://www.benzworld.org/forums/r129...ml#post2371322

[herb]

In my SL experience (300, 320, 500 over a ten year period), charging is most safely done with the battery removed or using a low output charger or a trickle charger with the battery connected in the car.
Once a body shop used a high output "fast" charger and blew out some electronic component deep in the engine compartment -- instant $1800 repair bill!

Herb

[aam]

Hi, all.
Sooner or later we all are going to jump start our cars.
To make the long story short.
What we have to avoid is.
1,Spikes, and shorts.

2,You must, connect the cables positive to positive.Negative to negative.
When your battery is low, for example less then11v.
And you connect an other battery 12.5v. = 1.5v x amp difference your spike is small,not significant.

Now if you have a running car next to yours you are sending 14v spiked to what the alternator x rpm + capacity of the other car = large spike.

If key is off and, no shorts, the spike stays at the battery poles, safe.
With key on , on low battery the spike has a way to travel and fry things up.
A spike can have more then 600v.

Some safe examples.
On a healthy battery.
Key off, and no shorts.

Connect a disconnected small battery charger to the battery +/- pols
Then you switch it on the spark is at the charger switch.
Then you see the gauge at 10amp you connect a d mm, on the battery and you have
less then 12.5.
Let it charge , and after a while it will go to 5/6amp read the d mm no more then14v.
Disconnect the charger switch first and the the clamps after, no spike.
Your battery is charged more then 3/4.

Now that is easy if you stay on top of things.

Our cars work on 11-14 VT.system.

Now we want to start car with an other car.
Our battery is at 10.5v. No start. You need more then 11v.
You bring other car Jump start.
Other car is healthy more then 12.5v.
You connect + to + -to -. No mistakes.
You go home.

You do the same thing only this time you are on less then 9vt and your battery or car is shorted, you will destroy the other cars alternator.

And if you were able to start yous, there goes your alternator, etc,etc.

The bottom line is.
It is like fire, if you know what you doing, you have a warm house.
If you don't, you set it on fire.

If this is too complicated.
Brink car next to yours kill the engine.
Connect cables from one to the other.
Start your car.
Disconnect cables.
Go home.

PS.
Yes ,batteries do explode. But this is a different story.
Hope this helps.

Regards,
aam.

[discobaysl500]

I had the same problem with my SL yesterday. My battery was about 5 years old so I just called MB road service and they were there in an hour with a new battery. Installed it and reset all the codes, windows, etc-no charge for labor. All I had to pay for was the battery-same price as if I had walked into the dealership. The tech did tell me to never jump start a SL. The danger is if the voltage from the other vehicle has a voltage jump above a certain level-approx 14 volts plus-you can blow all kinds of modules, etc. He said they are not even allowed to carry jumper cables with them to prevent a tech from jumping off a MB.

However, he said if you ever found yourself with no other choice to make sure(other than the obvious-positive to positive, neg. to neg.)--do not have the other vehicles motor running, only jump off the battery of a vehicle that was not running. This would minimize the possibility of a voltage jump that could harm the electronics.

Good luck.