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I will throw some darts. Voltage regulator/alternator CAN cause dash lights to dim, but the dimmer on those old clusters are also notorious for failing. Bummer on the AC, did you check you AC relay? It sounds like you are addressing most of the components, the relay was the only thing I didnt see you mention.
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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6
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