'83 240d possible alternator issue PLEASE HELP - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 10-17-2013, 03:21 PM Thread Starter
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Date registered: Oct 2013
Vehicle: 1983 Mercedes-Benz 240D
Location: Lancaster, PA
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'83 240d possible alternator issue PLEASE HELP

So I just bought an '83 240d last week and to my dismay let me sit. It would not crank so I figured the issue was a dead battery. Jumped it, drove it to AutoZone and sure enough the battery was bad and they replaced it. They checked the alternator, all good.

The car drove great for the entire day after I got the battery replaced, but the alternator was obviously not working because the next day it did the same thing, wouldn't crank unless I charged the battery. After I charged it and drove for a little while, the headlights started to dim, the radio shut off, turn blinkers stopped working, etc. Seems like an obvious alternator right? The previous owner said he replaced the alternator not long ago and was sure it wasn't the alternator. And AutoZone said it was still in good shape. I checked all the belts, and they are tight.

What could possibly be not allowing the alternator to charge my battery while I drive?

Thanks for the input.
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post #2 of 5 (permalink) Old 10-17-2013, 07:22 PM
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It could be a faulty voltage regulator, which is attached to the alternator. Does the battery warning light come on (with all the other warning lights) when you turn on the ignition?
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post #3 of 5 (permalink) Old 12-06-2013, 10:28 AM
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So, is it fixed ? Could be a battery drain, could be the alternator is bad, Autozone isn't a good substitute for a knowledgeable technician.
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post #4 of 5 (permalink) Old 12-06-2013, 11:15 AM
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I had similar experience with my CLK320 on Tuesday. I was driving with no power: no headlights, no ABS, no power windows, gas pedal was little responsive, all kind of malfunction alerts.....

I replaced the alternator the next day and all OK. MB wanted $1500CAN for the job (parts and labour) and I paid $500.

After you charge the battery, what is the voltage of your battery? Before starting the car, the voltage should be around 12V. After cat started, the voltage should be between 13-14.4V (depends on what accessories you turned on).

Before I changed the alternator, I charged the battery and it was 12V. After I started the car, the voltage would go lower and lower. This indicated that the charging system was not working. I went to my indie and it took him about an hour to replace the alternator. He told me that the voltage regulator was inside the alternator.
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post #5 of 5 (permalink) Old 12-06-2013, 12:04 PM
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Why didn't he just replace the regulator? That part is only $75 at the most.
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