Problems with 1989 420SEL - Mercedes-Benz Forum
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post #1 of 1 Old 03-16-2004, 08:16 PM Thread Starter
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Problems with 1989 420SEL

Ok so i get my uncles car and its al fine except that when driving at night teh car lights get real dim. So i decided to pull to the shulder. Put it in park and the lights get brighter. Next day i replace the alternator, jump the car and run it. drive it around and all seems fine. The next day i come home from work and the car does the same thing (lights get dim) pull to the side and charges back up. I was thinking that the alternator was defective. So my dad in the morning decides to take the benz to work. The belt on the car fell off off the alternator. Got it towed to my work and they put a new belt in. The car had trouble starting for some reason. The guy took the top cover for the air box off and got the car started. It was ideling at 1500 with was pretty high considering that it had no problems before and ideling at 800 or so. The car idles fine when it is in anything but Park and Neutral. I dunno whats up with it. I talked to a Benz specialist and he told me some steps to reset the computer or something but touching the postitive and neg. cables toghter with teh battery disconnected and then drive it. I didnt really do anything. Im new to this Benz vehicles. I dunno what is wrong or what to do. Any help would be helpful. Thanks
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