Question about Mercedes-Benz E-Class
If you know 100% that there is no light on such as under hood, glove box, trunk, interior dome, vanity mirror light, brake lights, or any other lights, then I suspect you may have a relay stuck. To find out if something is pulling power from the battery disconnect the negative cable and pull the fuse for the radio and clock. Even though the radio may not work with the key off, the presets are on another circuit and are pulling power. Now use a volt meter set to the 20 volt DC range. Touch one probe to the negative battery terminal and the other probe to the negative battery cable. You should read no voltage. If you do see voltage flowing something is on. Start pulling fuses one at a time while someone else watches the volt meter. When you see the voltage disappear then you have found the culprit. If after pulling all the fuses you still see voltage flowing then more than likely you have a bad diode in the alternator and the alternator needs replacing. If you pull a fuse and the voltage stops then you have found the circuit pulling power. You then have to figure out what is actually on that circuit which can be a relay sticking as in the power windows, power seats, etc. This is not an easy process and takes time and patience.
Posted on Mar 26, 2011
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Posted on Jan 02, 2017
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