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#1
12-20-2005, 01:00 PM
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W124 battery 92 300 TE4
I've had my battery go dead twice in the past few months after my 300TE4 was parked for over three days
It suggests a short or drain somewhere but I'd like to first find out the correct Mercedes battery for my car. The owners manual doesn't specify much What is recommended? And any guidance on where to start on finding my mysterious battery drain? Jim
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92 300 TE 4matic 
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#2
12-20-2005, 06:12 PM
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It's surely in your owner's manual.
For example http://mb.braingears.com/124_DISC2/Program/OM/E320_E420/OM_114.pdf "12V/62AH" is specification enough. Probably what your parts man will call "the small one" to distinguish from battery for a diesel.
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Kent Christensen Albuquerque '07 GL320CDI, '10 CL550. '01 Porsche Boxster Two BMW motorcycles
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#3
12-20-2005, 08:31 PM
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Thanks Kent
I didn't realize there were only two for the W124 The little one ( mine ) and the big one ( diesel ) Lots to learn about M-B Any thoughts on where to start to find the drain/short? Jim
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92 300 TE 4matic
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#4
12-20-2005, 09:04 PM
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Do you have a meter that measures amps and milliamps? Disconnect the positive battery cable and measure the amperage draw. Start with the amperage settings on the meter at their highest to avoid toasting your meter and work your way down. Touch the positive lead from your meter to the positive terminal of your battery and the negative lead from the meter to your positive cable. You probably have a significant draw. There is always some draw, but generally, more than 50 Milliamps is too much. Leave the doors of the car closed, the dome light will blow your readings and perhaps the fuse in your meter.
Now that you have some idea of what draw you have, start pulling fuses and watch for the amperage draw to drop. Aftermarket stereos and alarms can be a problem. Relays that are stuck in the on/closed position will also suck down your battery. Do you park your car in the garage and leave the key in the ignition all night? I've seen that be a problem on some cars. Tracking down a draw isn't much fun, but this is a reliable way to do it.
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Fourings  84 Audi Coupe GT with Turbo engine, EFI (buh-bye CIS), Jamex seats, Koni's/H&R's, e-code lights. 210k and counting. 1992 Anthracite 400E, 161k, "Grey Ghost". 1986 VW Quantum Syncro, 192k, gone to the crusher in the sky. 1989 300TE 172k. (Was mine, now also Mom's car) 72 280SE 4.5 (Mom's car)
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