Alternate(or) Theory
Here's a thought. Apparently, turn signals draw a lot of amperage.
Perhaps this initial dimming was caused by a battery that was not quite at full strength, and/or an alternator that had been 'asleep' a long time. Once the alternator blew out the cobwebs, it was able to keep the power flow strong and steady, thus no more flickering.
Again, just a thought...
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