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I am not a mechanic, however as an electrician it sounds like the running board lights are wired to the same relay as the interior lights. To check this, simply crank the truck, leave all the exterior lights off, turn on the interior light, then walk around the truck and look at the running board lights. If they are on then turn the interior light off and the parking lights on, check to see if the running board lights come back on. Depending on the make and model of the truck, I could be way off in left field and this info may not apply. uuummmm.....programing?

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16y ago

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