You said they've checked all the relays.... but how thoroughly have they checked the OVP, AKA, OverVolt Protection Relay? Your symptoms are classic OVP failure signs...
Do a search on OVP and you'll see for yourself.
The part is cheap (about $50) here @ FastLane, and very easy to install yourself...
Good luck!@
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2006 E350 w/ 155k miles (Daily Driver)
Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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