On the c280 not only the engine harness goes bad but the ea,cc/isc actuator or (throttle valve assy) also goes bad. On e class 92-95 starter harness,engine harness and throttle valve are bad. On the c-220 engine harness, trans harness, throttle valve , and air pump with harness goes bad. On 140's same as above except the starter harness is also alternator harness and when it shorts out throw in a pushbutton assy and a cluster. On the diesels glow plug harness and on some later ones the fog light harness.Keep in mind there are other harness that go bad not just engine harness".