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swaff
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swaff's post in Power surges (radio turning off, instrument panel flicker, light flick was marked as the answer
The fault ended up being resolved after changing out the ground cable at the battery. The problem was intermittent, but finally I was able to run some tests while the symptoms were occurring, and a voltage drop test from the battery ground post to the other end of the ground cable was showing there to be as much as a 1.21 volt drop with many other significant drops along the way.
To try the test on your own, with the car acting up, get a multimeter and touch the black probe directly to the battery's negative ground post and touch the red probe to the other end of the ground cable that connects it to the chassis. Be sure to touch the black probe to the ground cable's metal end and not the bolt or post that secures it to the chassis. You can then monitor and see if there are any voltage drops. You shouldn't see any drops more than 0.5 volts.
Much thanks to Ahsai for his extensive help on tracking down and solving this problem!
Swaff