Also check to be sure that the wiring harness from the alternator to the connection block is secure. When I replaced my alternator I didn't get the wires tight to the connection block and had similar symptoms.
Good Luck!
Bill
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Current Vehicles:
1990 Mercedes 300SE (147,000)
1985 Mercedes 300SD (203,000)
1983 Mercedes 240D (167,000)
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