Well, the car that it came from was Mfg in 2/95 it all comes down to your Vin Sequence. you can take your car in to a parts place and they can measure your idle charging, otherwise you can use a multimeter and test it I think it should charge at 13.4v IIRC however I may be wrong.

if you feel like it shoot me the Vin Sequence after F it should be F and some numbers to the end of it and I'll check if this harness is the right one for ya

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed