The 1986 thru 1989 used the 70A alt. The 1990 & later uses the 80A. You can install the 80A on earlier cars with the later wiring harness MB part # 124-543-45-26 (list $66.) The 80A works much better esp/w hi-power stereo systems OR in hot climates where the A/C runs all of the time.

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