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Originally Posted by dhspring
and why Olds routed the brake lights throught the turn signal indication, I have no earthly idea.
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All cars and heavy duty vehicles that don't have turn signal lamps separate from the stop lamps route the brake light juice through the turn signal switch. The majority of American cars use the same lamp filament for both stop and turn. That's why a single two filament bulb handles tail, stop and turn. In the turn signal switch the brake light juice is distributed via special wiper contacts so it is isolated from whatever direction is selected for indicating a turn, other wise both left and right would blink at the same time if the brake was depressed while your turn indicator was on.