Really dumb question/1991 190e 2.6
 

Battery died , I took it out and forgot what side is what. Need to know if the left side terminal wire in the battery compartment is the ground to the battery ? It is a short black wire that is secured to the body . The other black wire runs along the firewall and drops down by the driver side which I suspect is the positive. I bought a new battery and believe that the battery terminals are opposite of what they should be . I don't want to make another problem.
Thank you gentlemen (and ladies) css190e

You are correct. The ground cable is the short black wire secured to chassis.

Thank you very much sir !!!! I just had to make sure. The auto parts store did
sell me a battery with the posts "reversed" . Thanks again for your time .
Have a great weekend !