Battery Change Procedure CLK

[tristand]

Hi,

I found this thread http://forums.mercedesclub.org.uk/showthread.php?t=53200

Battery changes (203)
Needed will be a set of leads and a slave battery,
push the red button on the bonnet stay in to open the bonnet to its full
just next to the battery you will find a red cap with a + on it, this is the so call jump point, this is where you would connect your positive lead from the slave battery, on the off side you will find an earth point bolted to the top strut, use this for your earth lead from slave battery, now the car is live, disconnect the positive lead from the battery and tape up fully, this will stop any shorts, where the lead comes thought the plastic, you can lift up the small bit of trim and remove lead right out the way, just be aware that the clips holding this trim are very sharp, then what I do is pull the lead right out the way and tuck it under the brake pipes, hence the tape, disconnect neg lead and battery clamp, replace battery, do not disconnect slave battery until both leads are back onto new battery otherwise damage COULD be caused.

Can the Slave Battery be installed in another car and connected using Jump Leads with the "Salve Cars" engine not running?

 

[Craiglxviii]

I connected a battery charger rather than a slave battery. It's just to provide 12V DC to the car's consumers while you're swapping it out.

 

[tristand]

I have a CTEK battery charger which doesn't produce a voltage till is senses it's under load. I'm concerned that if I connect the CTEK and then remove the old battery that the CTEK may feed too much to the cars circuits damaging them. I read of that danger on another post.

 

[Craiglxviii]

Ah yes, that could be a problem. Mine's a generic Halfords jobbie.

Either way you just need to supply 12V DC to the battery leads while you swap the old battery out, however you choose to do it.

 

[tristand]

Would a battery sitting in another car, same setup as this(an E250 with a Positive Jump Point and an Earth Point) be safe?

Using Jump leads-

1. E250 Positive Jump Point => CLK Positive Jump Point
2. E250 Earth Point => CLK Earth Point
3. Disconnect Old CLK Battery, fist positive, then negative
4. Connect the new CLK battery, first the negative, then positive
5. Disconnect Jump Lead(Red) from the CLK Jump Point
6. Disconnect Jump Lead(Black) from the CLK Earth Point
7. Remove the Jump Lead(Red) from the E250 Jump Point
8. Remove the Jump Lead(Black) from the E250 Earth Point

Is there a danger of causing damage to either car?

Being ultra cautious here, but don't like the idea of being out a couple of hundred quid by blowing an ECU or SAM or even worse taking 2 cars out on one go!

 

[tristand]

On the other hand, what is the worst thing that can happen if I just disconnect the current battery and put in the new one?

I'll have to re-tune in the station on the Audio 20
or
will I have to put in a new code?

 

[AMGeed]

^ I don't think the modern radio's need a code now do they?
If your does, the dealer will supply it for free if you give them your vin#
No idea about retuning as I don't have an Audio 20.

I replaced my battery without connecting another battery or charger and only had to reset the windows and sunroof which is a simple job.

 

[television]

On the other hand, what is the worst thing that can happen if I just disconnect the current battery and put in the new one?

I'll have to re-tune in the station on the Audio 20
or
will I have to put in a new code?

On the E class there has never been any problem in disconnecting the batteries.

Just put new one in and reset the windows and roof, the ESP lamp will go away as you drive. No radio codes since 2000.

A battery charger could have a too high a voltage to leave connected just change it with key out of the car.

 

[turbopete]

On the E class there has never been any problem in disconnecting the batteries.

Just put new one in and reset the windows and roof, the ESP lamp will go away as you drive. No radio codes since 2000.

A battery charger could have a too high a voltage to leave connected just change it with key out of the car.

i think the car in question is a CLK this time Malcolm. possibly a new addition or not the OPs car? id guess a 209 since they have been looking at the battery changing procedure posted for a 203

 

[television]

i think the car in question is a CLK this time Malcolm. possibly a new addition or not the OPs car? id guess a 209 since they have been looking at the battery changing procedure posted for a 203

This was for post number 6. but I see it is the same OP.


it would help if the year of the car was put up for a 209

 

[turbopete]

to the OP: personally id rather use a slave battery or jump pack over another car, to avoid risking a spike to both cars, unless you have surge protected jump leads.

changing it the old way, you could get lucky. or you may take a SAM out if you are unlucky. i had no code to enter on my 2001 203 when i removed the radio (audio 10) so you should have no worries there

 

[tristand]

Yes the car in question is the CLK, C209, manufactured in mid 2005.

So the old way=remove the current battery and put in the new? Can that blow a SAM out?

 

[television]

Yes the car in question is the CLK, C209, manufactured in mid 2005.

So the old way=remove the current battery and put in the new? Can that blow a SAM out?

You should be just fine on a 2005 car.
Key out of car.
All doors closed
Then change battery

 

[ajlsl600]

clk

You should be just fine on a 2005 car.
Key out of car.
All doors closed
Then change battery

my clk requires radio code ,window and roof reset after batt change/disconect there is somewhere some posts about having a bit of a load on after changing battery ,before starting . it seems that a fully charged /slightly different spec battery can cause the regulator and in my case the maf to screw up. 2001 clk320 . i dont know if it was, in my case just bad luck ,but i did read on this or another site that hassle with these two items was not unusual following batt change . and the correct jump proceedure is in the handbook .

 

[television]

my clk requires radio code ,window and roof reset after batt change/disconect there is somewhere some posts about having a bit of a load on after changing battery ,before starting . it seems that a fully charged /slightly different spec battery can cause the regulator and in my case the maf to screw up. 2001 clk320 . i dont know if it was, in my case just bad luck ,but i did read on this or another site that hassle with these two items was not unusual following batt change . and the correct jump proceedure is in the handbook .

Yes if the new battery has just been charged, might be an idea to cream the top off so that the voltage is 12.5 volt

Radio codes were stopped in 2000, but the odd car will always come through.

To reset windows and roof, turn ignition on, open and close each window in turn and hold the switch closed for 5 seconds, the same with the roof. The ESP lamp will go away as you drive.

 

[tristand]

Dug up the manual, procedure seems straight forward enough. Take out the old one, put in the new one. Then reset the side windows and side mirrors. It also refers to the Audio 20 for a radio code, but nothing mentioned in the Audion 20 manual. I can live with calling MB on the off chance it asks for one!

New battery is reading 12.69V, so fully charged. What would be the best way to take it to 12.5V?

 

[television]

Dug up the manual, procedure seems straight forward enough. Take out the old one, put in the new one. Then reset the side windows and side mirrors. It also refers to the Audio 20 for a radio code, but nothing mentioned in the Audion 20 manual. I can live with calling MB on the off chance it asks for one!

New battery is reading 12.69V, so fully charged. What would be the best way to take it to 12.5V?

Do you have a spare headlamp bulb, 12 volt tyre pump

 

[tristand]

I'll have a look for a 12V halogen bulb and connect across till it drops to 12.5V.

Any point in having the headlights on when replacing the battery?

Thanks everyone for your help and advice.

 

[television]

I'll have a look for a 12V halogen bulb and connect across till it drops to 12.5V.

Any point in having the headlights on when replacing the battery?

Thanks everyone for your help and advice.

I would not turn anything on as the lamps are driven from the front SAM

 

[tristand]

will keep everything off.

thanks television