Auxiliary battery

[dragon]

Anybody had a need to replace the auxiliary battery in a 55 W211?

 

[jberks]

You mean a 55 plate 211?
I've not heard of one fail on any 211. The main battery, yes, in some of the early ones but nobody has mentioned the aux battery and certainly not on a 55 plate.

 

[television]

early 211 have 2 batteries and later cars only 1

 

[dragon]

early 211 have 2 batteries and later cars only 1

Huh? I thought self locking is the reason for the aux battery so starting will never failed if the main failed.

 

[television]

Huh? I thought self locking is the reason for the aux battery so starting will never failed if the main failed.

There are many different arrangements on the cars, on an 211 it has had problems

Its not too bad for those that know what their two batteries do, but for the average driver it can be deadly when the car is jump started from the wrong one, Like on the SL that I have been trying to help, the damage is unbelievable

 

[dragon]

There are many different arrangements on the cars, on an 211 it has had problems

Its not too bad for those that know what their two batteries do, but for the average driver it can be deadly when the car is jump started from the wrong one, Like on the SL that I have been trying to help, the damage is unbelievable

What damage? I read the manual to jump start the aux not the main. Am I right?

 

[television]

What damage? I read the manual to jump start the aux not the main. Am I right?

If this it what it says then that is right,, people leave their cars say at airports and the battery goes flat they try and jump the car, done from the wrong one causes the problems when 100amps or more pass through the connecting ECU that charges batteries, reverse current flow is one of the most damaging things in an electronic circuit.

 

[dragon]

If this it what it says then that is right,, people leave their cars say at airports and the battery goes flat they try and jump the car, done from the wrong one causes the problems when 100amps or more pass through the connecting ECU that charges batteries, reverse current flow is one of the most damaging things in an electronic circuit.

Thanks, I bear this in mind.

 

[jberks]

ok - now I'm confused. I have 2 batteries - one big one in the boot and a small one up front by the ECU. My understanding was that in the event of power failure, the small one is switched to run the SBC so you can still stop.
So, I can't understand why you would jump start from the small battery - aside from the fact that it's not exactly accessible, it doesn't run the engine.

What am I missing?

 

[television]

ok - now I'm confused. I have 2 batteries - one big one in the boot and a small one up front by the ECU. My understanding was that in the event of power failure, the small one is switched to run the SBC so you can still stop.
So, I can't understand why you would jump start from the small battery - aside from the fact that it's not exactly accessible, it doesn't run the engine.

What am I missing?

This has been done by people who do not know much when jump starting, as I said that most owners do not know what is what, and many car park attendants that do this jump starting are not the brightest buttons in the book. And yes I have seen a post where this has been tried on a 211. the most recent was a 230 and I only dealt with that last week

 

[dragon]

This has been done by people who do not know much when jump starting, as I said that most owners do not know what is what, and many car park attendants that do this jump starting are not the brightest buttons in the book. And yes I have seen a post where this has been tried on a 211. the most recent was a 230 and I only dealt with that last week

It you look at the user guide it tells you with a warning but didn't say the consequences. This is what Television was highlighting.

 

[dragon]

This has been done by people who do not know much when jump starting, as I said that most owners do not know what is what, and many car park attendants that do this jump starting are not the brightest buttons in the book. And yes I have seen a post where this has been tried on a 211. the most recent was a 230 and I only dealt with that last week

Resigned? Where are you off to now?:twisted: