Normally On Circuit with Positive Trigger?
This is a simple schematic, for alternative blinking. Turn bulb on, your led module off. Once the turn signal stops blinking, the running board would stay on, as long as your Switch is on. Side note, I hope you added a fuse to your wiring between the battery and switch. Safety first.







simulate this circuit &ndash; Schematic created using CircuitLab

The turn signal power must come from before the turn bulb, somewhere from the red circle, or a similar connection. (Wiring diagram for some unknown year of Mitsubishi Lancer, see page 9-70) Just tap/slice into it.