Recently my SD has begun not to charge the battery once the engine is running. Are there any electrical contacts I can check before taking the car to the shop? Up until last week I was getting 14-15 volts at the cigarette lighter as soon as the engine started. Now I don't see hardly any change when I shut off the car; in fact the voltage increases by .2 volts with the key in position "1". I do usually see the battery light come on when I turn the key on, but I didn't see it last night when the engine was warm, in position "2". I've been charging the battery to keep it going but I know this isn't a long term solution. Any common trouble areas to check for... alternator connections, etc.? TIA,

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Robert W. Roe
1983 300SD 264K mi