The OVP relay must have been the "click" I was hearing this morning as the idle would surge, then die down. Fuse in OVP not blown yet.

Guess I'm doing an alternator swap this weekend. FastLane price is very reasonable, and Phil was very helpful in pointing me in the right direction.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car