I don't think the tail lights are supposed to come on with the daytime driving lights (at least on my GM tv). If it is a GM the driving lights are seperate from the lighting system and head and tail lights should not come on until dark, or if the sensor on the dash is covered by something. I don't know if your tv/as worked together in the past, but if they have not been used together previously the wireing may not be the same on both vehicles. Otherwise, the previously mentioned bad bulb or ground is a good place to start.
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