Positive jumper to starter, or anyplace along the electrical system. Negative to ground.
But whats the big deal about accessing the battery...in the trunk rather than the hood? where is the starter in c230?
Check the battery.
Dead or weak battery? Alternator not charging battery properly?
Battery is dead.
my 1999 wouldn't start. i replaced the battery cable and it runs now. i hope this helps
Yes
You need to replaced the starter or the alternator.
No
NO
If the battery was dead or disconnected all trouble codes will be erased.
If none of your lights work , it sounds like a bad battery cable connection or a dead battery
Check battery earth connection.
bad alternator, dead battery.