Hi guys,

Just got a 1980 240D yesterday. It was running fine, but when I turned the headlights on during the drive, they seemed dim. Once I got home, I turned the car off and got my volt meter. The battery read 11.2 V. After sitting for 24 hours, the battery read 12.2 V. I started the car and checked the battery while it was running and the voltage kept dropping. When it hit 9.4 V or so, it slowly started climbing. I turned the car off, went inside, and scoured the threads here. Still not sure what the problem is, but I'm leaning toward the alternator. I checked the battery about an hour later and it read 12 V.

After reading many posts, I think maybe the alternator belt is a bit loose, but can't figure out how to tighten it. I scoured the posts again, but couldn't find a description for this car. Can anyone tell me how to do it?

Thanks much.