Interior lights don't take much to operate. Sounds like it may be time for a new battery.
I've never seen much sense in paying MB for one of theirs; that's just my opinion.
I've used Interstate and currently have an A/C Delco going on 4 yrs - clean - no leakage.
Batteries are like oil - lot of opinions.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.