Have you tried the same tight turns, but at a very low speed, or with the front wheels off the ground? I ask because I had a similar episode awhile back and discovered that the battery clamp on the negative cable was slightly loose. Straight line driving was perfectly normal, but any hard turns and I got slight flickering of the lights and occasionally a kick back in the brake pedal, presumably due to the ABS getting a power flicker.
KuoH
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