Before jumping all over MB (though they would do an Ollie North and deny, deny, deny) watch out for aftermarket electrical installs.
When I owned a car electronics biz, we saw TONS of phone, stereo and other gizmos installed by owners UNFUSED. Amplifiers running wire from the battery post to the amp unfused. After time, the wife chafes, works loose, etc, and "poof" the car is toast. (get it?) Seen a modern car with a small electrical fire? It's a large fire in seconds. That plastic stuff might as well be made of gasoline.
1998 C230 "Black Betty"