1984 Mercedes Benz 300d Repair Question
I have a weird electrical problem. I replaced my alternator it worked for a week. Now it's barely charging.
So the symptoms are: lights not coming on during start, no cruise control (not 100% sure if it's related) when the other stuff is on the fritz, and alternator not charging the battery.
(I know very little about the car's electrical system so my theories may be a bit off) My theories are: bad alternator cable, bad ground wire somewhere, bad ignition switch, or bad relay in the dash.
i'm not a mb expert y far, but looking at the wiring harness, the alternator ties in with the glow plug box. in it is a fuse tha tmay be burnt up. you should replace the wires that are burnt with new ones as that can't be helpingmuch at all. Also dont' be surprised if the alternator is burnt up as well. An auto parts store can check to see if it's good or not,normally for n/c. harness pic included.
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Thank you for the quick reply. Well I just went to take a look and I think I can see the fuse. It just looks like a little plate held down by two screws and on the side of the relay it says 80amp. It looks all fine and dandy from what I can see. I would think that the glow plugs wouldn't work if that was burnt out though. And they do their job as long as I flip the switch. The relay sounds more complicated than I thought. There might be another part in it that's shot. I'll probly pull out the alternator (royal pain in my butt to do... the mounting assembly is strange) and try putting in a new regulator first (if it fails the test). Then if that doesn't work I'll mess with some cables. Also the photo was helpful. Thanks.
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