Check the voltage regulator for wear and or replace
I had a similar problem with my 300TD and turned out to be a worn voltage regulator, generally mounted on the rear of the alternator. Easy to obtain at local patys house and about $10
Good luck
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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)
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