sure sounds like it is the ETS/ETM. However the lights dimming and brightening may indeed be the alternator, as suspected in the original post. This however should not cause issue at highway speeds. I would get both checked out. Alternator can be checked at a PepBoys or Autozone. The ETM is a dealer only item, but currently is under warranty until 200K miles or 10 years ownership, so you should be okay. Good luck!
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.
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