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I watched John’s video on these and have a question about installing them with his prefab harness——do they stay illuminated in red whenever your
lights are on or only when you’re in park?
As far as the red backlights you mean?
With the tail light adapter option, whenever the headlights, parking lights are on, and when you open the doors, lock or unlock the truck, etc. Whenever the marker lights and the tail lights are on, so will be the red backlight. Its on the same circuit.
Watch this short video at the 3:10 mark
John