Yes, intermittent troubles are the toughest. The worst of them validate the parts cannon approach.
Your voltage drop reading is not a red flag. When the ground wire fails, the voltage dropped across that "circuit" is about 14000 millivolts. :-)
But, the wire fails because of a poor connection, and most poor connections are sensitive to mechanical disturbances to become intermittently poor.
Just revisit the brush pack when you have a fine warm bright day to mess with the car. Meanwhile, get a cheap cigar-lighter voltmeter so you at least have 30 miles or so warning when it quits again.
--
Art Benstein near Baltimore
A Stranger is just a friend you haven't met yet.
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