Battery earth

[area51]

I would like to know where the battery earth cable attaches to the body on a W168.

I do know that the earth cable is bolted to the rear of the sump pan but there is a slightly thinner cable that bolts to the body somewhere underneath the car.

 

[Ted]

Just follow it.
Earth cables are usually around six inches long - rarely more than a foot.
Any more and the voltage drop in the circuit starts to become excessive.