E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

Weird Electrical Problem

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Old Aug 18, 2013 | 01:55 PM
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puiu34navy's Avatar
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1991 Mercedes 300D
Weird Electrical Problem

Hey guys! Everyone experienced this issue?

For the last two-three weeks I am struggling with a weird symptom: battery is either going dead overnight...or right after a 30 min drive. No battery light coming on on the dash or something like that. Alternator is charging properly and the battery is checking out good( advance auto guys checked on it with their battery scanner). Connections are good at the battery...I don't know where to look anymore in order to find out the problem. Any advice would be helpful. Thanks!
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Old Aug 19, 2013 | 12:48 AM
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Saijin_Naib's Avatar
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1990 300ce 24v I6
Do you have a non-contact voltage detector or a test light?

See if any of the fuses are live after the car is off. Something may be shorted.
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Old Aug 19, 2013 | 10:12 AM
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1991 Mercedes 300D
Hey...thanks for the input. I already changed the tailights assemblies(the old ones were kind of leaky-found little water inside of them) and I disconnected the newly installed radio. So far, is good for now. Now, I have to reconnect the radio to see if that is the culprit.It's weird, because the battery dies right after driving the car for 30-40 min (Pull in the driveway, turn off the car, try to start right away-not enough juice in the battery-had to jump start). No battery light on dashboard, no other lights. Weird, isn't it?
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