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post #1 of 19 (permalink) Old 04-18-2019, 04:31 PM Thread Starter
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Battery Weak

1999 E320, 190K miles.

The car's battery was weak and not able to start the car. I used a battery load tester and determined that it needs to be replaced. A new MB battery was installed. It worked for several days and it's weak again. I measured the alternator output and it's charging the battery at 13.86V. Is that alternator also weak and needs to be replaced too?

Thanks for your input.
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post #2 of 19 (permalink) Old 04-18-2019, 05:06 PM
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You have something draining your battery when the car is off. You have to find it by using a multimeter and measuring the draw in milliamps. Then you have to start pulling fuses until you see a noticeable drop in draw. Once you find which fuse is causing it, you have to then look and see what components are on that circuit and figure out which component is causing the current draw.

I had to do this in September of 2017. Turned out the cause of my dead battery after 2 days was the teleaid module not going to sleep. I just unplugged it and the battery drain stopped.
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post #3 of 19 (permalink) Old 04-18-2019, 06:47 PM
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Where is the teleaid module?

Sixto
98 E320s sedan and wagon
02 C320 wagon
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post #4 of 19 (permalink) Old 04-18-2019, 07:06 PM
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Where is the teleaid module?

Sixto
98 E320s sedan and wagon
02 C320 wagon
Behind the trunk lining, on the left side of the trunk, next to the left trunk hinge.
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post #5 of 19 (permalink) Old 04-18-2019, 08:22 PM
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Originally Posted by illstplaya View Post
You have something draining your battery when the car is off. You have to find it by using a multimeter and measuring the draw in milliamps. Then you have to start pulling fuses until you see a noticeable drop in draw. Once you find which fuse is causing it, you have to then look and see what components are on that circuit and figure out which component is causing the current draw.

I had to do this in September of 2017. Turned out the cause of my dead battery after 2 days was the teleaid module not going to sleep. I just unplugged it and the battery drain stopped.
There are dozen other things that may cause battery drain. Teleaid should be disconnected because it is defunct, obsolete and worthless.

1972 280SEL 4.5
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post #6 of 19 (permalink) Old 04-18-2019, 09:26 PM
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Was Tele-aid available in a 1999 E320 ?
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post #7 of 19 (permalink) Old 04-18-2019, 10:08 PM
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The teleaid was an example of the battery drain that my car had lol.

I don't know if his car even has a teleaid module. The point was to give some relief and let him know the weird battery drain issues happen to everyone and it's usually not a difficult problem to fix.
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post #8 of 19 (permalink) Old 04-18-2019, 10:09 PM
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Quote:
Originally Posted by illstplaya View Post
You have something draining your battery when the car is off. You have to find it by using a multimeter and measuring the draw in milliamps. Then you have to start pulling fuses until you see a noticeable drop in draw. Once you find which fuse is causing it, you have to then look and see what components are on that circuit and figure out which component is causing the current draw.

I had to do this in September of 2017. Turned out the cause of my dead battery after 2 days was the teleaid module not going to sleep. I just unplugged it and the battery drain stopped.
There are dozen other things that may cause battery drain. Teleaid should be disconnected because it is defunct, obsolete and worthless.
That's true. But you do lose one useful thing and that is the voice control feature.
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post #9 of 19 (permalink) Old 04-18-2019, 11:42 PM Thread Starter
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Behind the trunk lining, on the left side of the trunk, next to the left trunk hinge.
Thanks for your suggestions. I will perform the battery drain diagnose as suggested.

My 1999 E320 does not have the antenna on the roof. Does that mean it does not have the teleaid?

To unplug the teleaid module, I assume it involves removing the trunk lining. Can the teleaid module be easily identified?
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post #10 of 19 (permalink) Old 04-19-2019, 01:47 AM
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Before you pull your trunk lining, check if you have a red SOS button next to the front dome lights. If you do not, you do not have Tele-aid.
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