How to Split Combined Turn/Stop Signal on US Cars Using Taillight Converter Circuit?

The discussion addresses the challenge of splitting combined turn and stop signals on US cars that use a shared wire for both functions at the taillights, resulting in a three-wire system: ground, parking light, and combined turn/stop light. A practical solution involves using logic to differentiate signals: the stop light activates when both left and right turn signals are on simultaneously (e.g., during braking or hazards), while individual left or right signals indicate turns. This logic can be implemented electronically using a oneshot function, which can be realized with an LM555 timer IC. An alternative approach is to run a separate wire from the high-mounted (third) brake light to reliably detect the stop signal, effectively converting the system from three wires to four. Another suggestion is to physically separate the common power connection between the two stop bulbs and connect each to their respective turn indicator circuits, simplifying the conversion. The high-mounted stop light is clarified as the third brake light, which can serve as a dedicated stop signal source. Overall, building a taillight converter circuit to split the combined signals is feasible with basic electronic components and logic design.
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