what is the thing on the negativ batry terminall
specifically , what "thing" ?
Connectors for more ground wires. They are a big problem if you ever let your battery cables get so corroded and they will short from time to time. If that ever happens you can to chop the bad end off and splice them together and solder everything to a new negative battery cable.
Learn to spell for starters.
Looking for a Used Escort in your area?
CarGurus has 457 nationwide Escort listings and the tools to find you a great deal.
Search Ford Escort Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Ford Escort Experts