1976 300D - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 10-25-2012, 12:30 PM Thread Starter
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1976 300D

I notice that my head lights and dash lights will sometimes cycle from bright to less than bright. Do you reckon the alternator is trying to tell me something?
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post #2 of 7 (permalink) Old 10-27-2012, 02:09 PM
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Possibly, but check & clean all the connections and plug of the headlights too. Have you measured voltage during running?
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post #3 of 7 (permalink) Old 11-02-2012, 01:09 AM Thread Starter
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Well, now I had a trip where the battery over heated, and boiled water out, think it might be the voltage regulator. A Was running lights, gps, stereo, windshield wipers, stopped to get a coffe, popped the hood, and the battery was venting. Had to slowly remove the tops and ad water, further driving with out the lights, and radio seemed to help the situation, and no wipers. Anyone offer an opinion, voltage regulator?
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post #4 of 7 (permalink) Old 11-02-2012, 09:06 AM
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Sure they are easy to find. Most auto supply houses - even the dealer. It's not expensive.

They are on the alternator and come with new brushes (all in one unit). You don't need to remove the alternator - just swap this small plastic part. There's a nice video on this, I'll see if I can find it (when I get to work of course).


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post #5 of 7 (permalink) Old 11-02-2012, 09:43 AM
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Here you go - this shows all and he sells the parts and a small ratcheting right angle screwdriver which is handy since things are a bit tight in there.

Mercedes Early Internal Meyle Square Voltage Regulator

Good Luck
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post #6 of 7 (permalink) Old 11-04-2012, 07:02 PM Thread Starter
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1976 300D

Tested the voltage to the battery, over voltage, so my hunch was correct, thanks for the inputs, checked out some prices, not to much, cheap after market, or a 50 dollar a german made, that should hopefully fix that gremlin.
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post #7 of 7 (permalink) Old 11-12-2012, 11:23 AM Thread Starter
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Changed the voltage regulator , works like it should now, lights stay bright, no over charging of the battery. Did the front wheel bearings at the same time. Funny thing on that, ordered bearings for a 300D, they were just A BIT LARGE, so went back and compared them to the old ones, they fit a 240D, go figure.
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