Years ago trucks had a "blink marker light switch" a push button like a door bell button but its normally closed and when you push the button it opens the circuit... it could be that someone had wired in a "blink marker light switch" to trip off/on either the clearance lights or the head lights when needed to signal someone passing, or after you pass someone...
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Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction
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