When I’ve used this exact box as intended (input and output) it has issues on my truck. When using turn signals, it flashes both tail lights. Brake lights work, and turn signals work when brakes are applied but when running lights are on, both tails flash when a turn signal is on. So there’s something wonky with how this box works. I don’t know if it would work better in the application we are discussing which basically is reversing its intended use...but I’d be willing to try.
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