One problem related to wiring has been reported for the 1996 Mercedes Benz 300. The most recently reported issues are listed below.
Car stalls at 40+ mph in traffic apparently choked for fuel. After 5 to 10 minutes at rest - the car can be started although the key must be held in the start position for 30 to 40 seconds. This is a 1996 300d Mercedes Benz 4-door sedan. It was diagnosed by a certified Mercedes Benze repair center, cummins automotive, which verified thru fault codes that he engine wiring harness is bad. Upon inspection they have found insulation wear that has caused the fault (wires touching each other) that has caused the stalls.