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500 miles without electricity and how to fix it! (alternator rebuild)
Hello to all,
I purchased an Ebay 1984 300D turbo and during the drive from California to Arkansas I begin to lose several functions. First the radio and AC then the window were very slow rolling down. My battery was a 1000 amp unit but my alternator failed. I never shut the car off and did my refueling with the car running. Made it home safe and sound. I am now hooked on the old diesel Mercedes. Battery voltage was 5.75 VDC! Luckly I made it before it got dark! Now the fix. After a little rest I put the battery on charge until 12.8 volts was reached. The car started right up and my digital fluke showed a stable reading of 12.5 VDC. No charging was taking place. I revvvvved the motor up and the alternator would charge some times and some times it wouldn't Disconnected negative battery lead!!!!!!!!!!!!!!!! I removed the alternator and it looked new. I found a tag which said " rebuilt, made in Germany. I removed the regulator/ brush assembly. The armature rings (2) were black but not in bad shape. The brushes were very worn. Length 1/8". I went to a local motor rebuild shop with part in hand. They did not have my exact regulator but they gladly installed two new brushes and soldered the wires in place. They provided a small piece of sand paper to clean up my armature rings. I cleaned the armature rings and installed the regulator/brushes (easy) tightened the two screws and reinstalled the alternator. 17MM wrench. Results: I have a Fluke DC amp clamp and Fluke digital volt meter. With both meters in place I fired the car up and here are my readings. 12.9V @ 26 amps! (battery was in need of some charging) I drove the car on some back roads for about 20 minutes and then re-tested. 13.5V @ 16 amps! Tested again the next day after driving to work. 14.2V @ 6 amps! Total cost $19.95 and about 2 hours of labor. I hope this helps someone else. Last edited by Ashley; 06-15-2005 at 10:52 PM. Reason: type o's |
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