Date registered: Jun 2012
Vehicle: 1998 E320 base sedan @ 160kmiles
Location: Boca Raton, FL
Mentioned: 79 Post(s)
Quoted: 1187 Post(s)
Not so simple.
What Kilmer suggests may be OK for old cars, but the new cars support many circuits per fuse, plus not all circuits are supplied by a fuse (e.g. the blower regulator).
In many cases, the current drain small and is not enough to light a test bulb. Witek's suggestion is a good one. It is always a great idea to find out exactly what the drain current is. It usually leads to possible clues.
There is also voltage drop measurements on each fuse. As each fuse has certain resistance, if certain amount of current flows through the fuse, it will provide a voltage drop in the millivolts range. This is a non-intrusive test, but requires some experience, a decent voltmeter, and knowledge of standard fuse resistances.
BTW: If the car is a 2002 E320 wagon, it belongs to W210, if sedan it is W211.
Last edited by mrboca; 07-25-2019 at 12:46 PM.