Seems that way. I have auto headlights so maybe at night when they are on full, the trailer lights might be still on. I seldom drive at night so I've never really checked that scenario. How I found out about this was the last day I was trying to figure out my lights my neighbor walked by and said I had no headlights on the truck even though it was idling in the driveway--not even the daytime running lights. Yeah! Voodoo for sure.