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#1 Old 01-08-2009
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jump start danger

Hi everyone, a friend of mine who works for Mercedes has just told me that if you jump start the SLK it can blow a number of the control units. Has anyone heard this or know if it's true?
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#2 Old 01-08-2009
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DansSLK has been warning about this for a while. If the owner's manual does not specifically indicate that one can jump start the vehicle, I wouldn't do it. It's worth investing in a battery trickle charger.

It is odd though that the US spec SLK owner's manual has specific instructions on jump starting with lots of warnings and which specific points to use in terms of + and - terminals.

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#3 Old 01-08-2009
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...personaly i dont have the answer but i remember myself jumpstarting with my SLK battery my other old car. So this is the oposit way around.
And reading your thread here makes me worry of possible electronics damage that i may have caused this way to the R170.
I should avoid doing this in the future....Thanx for the info anyway !
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#4 Old 01-08-2009
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Yes, the most damage would come from using your SLK to charge another car, since that starter and battery is pumping back into your car. Furthermore, NEVER EVER connect two cars that are running (i.e. start the working car, then start the other car while the first is running). I have very personally seen that blow several fuses and relays.

The safest way to jump start, if absolutely neccesary, is to disconnect the other car from its battery, connect the positives to each other, and hook that battery's negative to your ground. This effectively gives you the average of the voltage of the 2 batteries, but an increase in amps. Wait a couple minutes, start your car, and then immediately disconnect the other battery. avoid multiple contacts (lot's of sparking) as that's when the voltages are spiking.

No matter what, you should use a trickle charger if possible.


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#5 Old 01-26-2009
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My car was jumped and blew the fuse on the back of the radio. It ran fine for a couple weeks but now it only clicks when I turn the key. What relays should I check?
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#6 Old 01-26-2009
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Quote:
Originally Posted by jmorse62 View Post
My car was jumped and blew the fuse on the back of the radio. It ran fine for a couple weeks but now it only clicks when I turn the key. What relays should I check?
Silly question, but have you checked the battery?
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#7 Old 01-27-2009
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Thats interesting.

Here in the U.S. so many of these cars are sitting on lots for months. When I was shopping, I usually left because they had to go jump start a battery.
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#8 Old 01-27-2009
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Are you sure it was a jump start? MB have one of those booster pack thingys (forget the proper name) that we can use, its like connecting an additional battery as you would in a jump start but without all the voltage spikes because it connects/disconnects itself.

Its hardly what i would call a safe solution but its better than a traditional jump.
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#9 Old 01-27-2009
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Quote:
Originally Posted by DansSlk View Post
Are you sure it was a jump start? MB have one of those booster pack thingys (forget the proper name) that we can use, its like connecting an additional battery as you would in a jump start but without all the voltage spikes because it connects/disconnects itself.

Its hardly what i would call a safe solution but its better than a traditional jump.
Yeah I didn't know that that isn't called jumping, sorry. However, one time I watched them do it, the top wouldn't go down, a fuse was blown. Maybe it was caused by the non-jump jump start.
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#10 Old 01-27-2009
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Yeah it most likely was caused by that
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#11 Old 01-28-2009
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Mine was a jump start from another vehicle. The battery is good, and has been fully charged.
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#12 Old 01-28-2009
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I would have no problem jump starting the SLK or using it to jump start another car If the SLK could not be jump started they would not provide the terminal in the engine compartment for just that purpose.
And they would remove the step by step instructions out of the owners manual.

I'm sure you could do some damage if you hook them up backwards but not if you follow the procedure in the manual. it's no worse then replacing the battery.

But if you're really worried you can let that nice tow truck driver drag your car up the flatbed now that's scary.
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#13 Old 01-29-2009
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Quote:
Originally Posted by caraddict View Post
it's no worse then replacing the battery.
No, it really isn't the same.


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#14 Old 01-29-2009
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Quote:
Originally Posted by caraddict View Post
I would have no problem jump starting the SLK or using it to jump start another car If the SLK could not be jump started they would not provide the terminal in the engine compartment for just that purpose.
And they would remove the step by step instructions out of the owners manual.

I'm sure you could do some damage if you hook them up backwards but not if you follow the procedure in the manual. it's no worse then replacing the battery.

But if you're really worried you can let that nice tow truck driver drag your car up the flatbed now that's scary.
cyber's right its not the same at all, MB have to provide some sort of emergency procedure just like they have to let the car run on the low grade fuel shown in the manual, doesn't mean its recommended or particularly safe and while the US owners manual might omit it the EU manuals and WIS do not.

That terminal is not really just a jump point, we can use it for booster connection, charger connection or for a second battery when we are replacing a worn out main battery so it has lots of uses and it would be a real PITA for us working on them if they removed it.
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#15 Old 01-29-2009
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Well then that's dumb if there's any risk to the car it should be in the manual just as it states not to pull start the automatic it should say the same about jump starting.
I'll still jump start it or jump start that hot chick stranded on the side of the highway
If it can't take it I wont buy another one no big deal.
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#16 Old 01-30-2009
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there's a much easier solution, just buy one of those $40 dollar battery tender, jumpers...it safely and quickly charges your battery, enough to jump start a car, and contains it's own battery which you charge at home. I used to have one in the trunk of my car, until my 'friend' borrowed it and never returned...because he loaned it to someone else!


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#17 Old 01-30-2009
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Quote:
Originally Posted by cyberdrakon View Post
there's a much easier solution, just buy one of those $40 dollar battery tender, jumpers...it safely and quickly charges your battery, enough to jump start a car, and contains it's own battery which you charge at home. I used to have one in the trunk of my car, until my 'friend' borrowed it and never returned...because he loaned it to someone else!
You're right that's probably a better solution or use the pickup truck.

Still though if there was even the slightest chance that you could fry electronics doing it correctly it should be stated in the manual that this car is not capable of being jump started or jump starting another car.
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#18 Old 01-30-2009
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Quote:
Originally Posted by caraddict View Post
Still though if there was even the slightest chance that you could fry electronics doing it correctly it should be stated in the manual that this car is not capable of being jump started or jump starting another car.
Yes your absolutely right caraddict it really should say that but just because it doesn't say it inyour manual doesn't mean it's wrong, the people on this site know a damn side more about the SLK than the people who wrote that manual (MBUSA), so while you're under no obligation to take our advice on-board it would be advised.
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#19 Old 05-02-2009
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Damn i'm stupid. I left the parking lights on all night thinking it was on Auto (too Dark to see at night). Anyway, this morning i couldn't unlock the car and i figured the battery is dead. Called Road side assistance to see if i could do it on my own, she told me yes. I start my other car, put in the jumper cables on both and i still couldn't start the MB cause the alarm kept going off. I called Roadside assitance again, and they said i shouldn't do it on my own because there is a risk of blowing up your electronics / radio etc. I'm like wtf. Anyway, i'm waiting for roadside to send me someone to jump start it. =/
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#20 Old 05-02-2009
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Quote:
Originally Posted by d3athr0w View Post
Damn i'm stupid. I left the parking lights on all night thinking it was on Auto (too Dark to see at night). Anyway, this morning i couldn't unlock the car and i figured the battery is dead. Called Road side assistance to see if i could do it on my own, she told me yes. I start my other car, put in the jumper cables on both and i still couldn't start the MB cause the alarm kept going off. I called Roadside assitance again, and they said i shouldn't do it on my own because there is a risk of blowing up your electronics / radio etc. I'm like wtf. Anyway, i'm waiting for roadside to send me someone to jump start it. =/
The $50 to $60 spent on a battery trickle charger is worth it. It's quite easy too once you do the pre-wiring.

I hope you get the vehicle running after Roadside assistance, then charge the battery by taking a 30-minute roadtrip and perhaps get a trickle charger (I use Battery Tender, C-tek is also good as MB sells them after applying their MB label and an extra $30 to the base price).

With these vehicles, some form of electronics are always on (w/ small draw on power). I did something similar by forgetting to remove the key from no.1 position overnight. Luckily, I already had the pre-wiring done and the battery trickle charger handy.

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