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#1
05-12-2014, 08:44 PM
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1993 600SL kills batteries DEAD.
Hi All- I'm working on the above mentioned R129- a little out of my comfort zone as I'm an older model tech.
Since I've known the car, it has a problem with killing batteries over time. Usually, a remove and charge will solve it, but lately it has been killing batteries DEAD- so dead that they won't even charge! First one was about a year ago. Took it to the battery vendor- they did all the checks and pro rated it, saying "defective battery". That one lasted about eight months, then same thing- Dead, and won't take a charge. At that point, I swapped in a known good battery, three years old, of the proper type from another car that's laid up getting a refurb. This battery is a different brand, and had always performed flawlessly. Yesterday, the car was started and driven with no issues. Today, out of the blue, the battery is dead- dead- dead, and is failing to take any kind of a charge. Battery has been in the car about ten days! I have read that these cars have a "sleep mode" which is activated when the doors are locked, but I can't find any real substantiation of this. The owner (a collector), parks it in a big barn with all his other toys and never locks the doors (although I finally trained him to at least remove the key from the ignition to shut the radio off!) I've seen many cars drain many batteries, but I've never seen one seemingly randomly and instantly kill them like this so that they can't even be charged. Any ideas?
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1968 230S Automatic, Elfenbein 1975 O309D Executive Westfalia Camper Bus, Blau/ Weiss 1972 280SEL 4,5 Dunkelrot 1966 VW Type 34 "Grosser" Karmann-Ghia 1963 VW 1500 Variant Pearlweiss 1969 VW Variant Automatic, Perugruen 1971 VW Squareback Automatic, Clementine Orange 2001 E320 4Matic Wagon- Our belated welcome to the 21st century! Polar White 1973 280SEL 4,5 Sliding Roof "The Bomb", Dunkelblau. 
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#2
05-13-2014, 04:30 PM
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Put a clamp on amp meter on the alternator battery wire, the draw should be zero. When diodes fail in a shorted mode they will drain the battery.
Leave the trunk closed for at least 10 min, open it then feel the bulb, if it is hot the trunk light is staying on. ( There is a microswitch on the latch, look for the yellow lever you flip when shutting off the light when trunk is open. ) Next put the clamp in the battery wire and check fro a load.
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#3
05-14-2014, 03:14 PM
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Quote:
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1968 230S Automatic, Elfenbein 1975 O309D Executive Westfalia Camper Bus, Blau/ Weiss 1972 280SEL 4,5 Dunkelrot 1966 VW Type 34 "Grosser" Karmann-Ghia 1963 VW 1500 Variant Pearlweiss 1969 VW Variant Automatic, Perugruen 1971 VW Squareback Automatic, Clementine Orange 2001 E320 4Matic Wagon- Our belated welcome to the 21st century! Polar White 1973 280SEL 4,5 Sliding Roof "The Bomb", Dunkelblau.
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#4
05-14-2014, 11:32 PM
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Also check the motor for the power antenna, sometimes they get stuck on. The vacuum motor for the power locking system will sometimes cycle on and off if there is a vacuum leak in one of the vacuum circuits connected to the manifold in the trunk (located on the right side). If you find that the trunk lid is "popped" open when the battery has died, test the vacuum check valve in the trunk release system. BTW modern battery chargers won't charge a totally dead battery if there isn't enough voltage for them to sense proper polarity connection. The battery may still be serviceable, i.e. rechargeable, but you need to somehow get the process started. I have a small 1 amp charger that isn't polarity protected, so I use that to get enough terminal voltage, then I switch to the higher current charger. I've had the same phantom "dead battery" issue with my 91 SL from time to time.
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Resistance is Futile.
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