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I can't answer why but with mine and I'm running the stock turn signals it was just plug and play didn't have to add in a diode and have had any cross or 4 way action. Just worked as normal.



If you've bought one that's specifically designed for this application (ie: two signal wires and no earth wire) that'd explain it. Else it should only work one way and not the other.

Matt Electronic mods for TBA/SM!