An old, old thread. Just wanted to give an update. I had my mechanic perform the 143a alternator "upgrade" to my '89 300CE about six or seven years ago now. Can't remember exactly because it has been working flawlessly since being done. No issues at all...absolutely none! Can't remember if the cable was replaced or not. I'd have to check the mechanic work order.

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-Steven

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1959 190b, totalled
1968 220D, sold
1969 230/8, sold
1980 240D manual, gave away at 300k (stupid me)
1985 190D 2.2 manual, gave away to a youngster
1989 300CE, sold when I retired - major regrets