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 Strange alternator operation
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930 Posts

Posted - 09/09/2017 :  22:23:10  Show Profile  Visit abl567's Homepage  Reply with Quote
Recently my alternator light has begun to remain on after starting, not charging at all, then after reaching operating temp it goes out suddenly. I've installed a volt meter now and can confirm it is charging the instant the light goes out. It will sometimes glow very dimly, with no charging, and sometimes glow brightly, again no charging. Once it is out it charges at 13.2-13.5 volts.
Today on start up it went out immediately, charging at 13.5 volts, but came on and stopped charging at the end of my driveway, about 200 yards, then went off and charging normally after warm up.
Any suggestions? Bad earth maybe?

6.3 #2723, my first classic Benz
3.5 #8659, my second.
2 to go...


9 Posts

Posted - 09/11/2017 :  12:51:45  Show Profile  Reply with Quote
When I had exactly the same problem it was one or both of the carbon rods inside being slightly stuck due to deposits etc. I removed the alternator and massaged the rods back into free movement. Taking the alternator out was not as intimidating a task as it might seem at a first glance. I took it out from underneath removing only the handbrake wire, if I remember correctly. Disconnecting battery, removing belt and electrical connections goes without saying. I have the old original alternator with internal regulator/carbon. If you have a later style exchange unit with external regulator it might be even easier.

Best Regards

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