Ok, i was checking some things on the car yesterday and found something that was indirectly related i think. Two or three years ago i had the alternator bench tested and rebuilt at a local automotive electrical shop, and sometime around then is when i started noticing higher running temperatures. Well yesterday i checked the voltage across a new battery i bought recently, both with the engine off and running. With the engine off i got 12.9V, which is very reasonable. Then i checked with the engine running and got a reading of 14.1V. Most of the german cars i've had, along with what i've read on some of the old threads here, lead me to believe that it should run right around 13.5V. Now being that the temperature gauge is nothing more than a voltage meter (or so i've read here), is it possible that the higher running voltage is the cause of my higher temperature readings on my gauge?

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1985 300SD "Battleship"