I recently installed new tail lights, the IPCW ones. The problem I am having is very odd though. They work great, they light up all four when braking, turn signals work perfect, same with hazards. But for some reason they do not light up at night with the headlights on. I do not know what could cause this, any help would be greatly appreciated. I need to get these working ASAP since they are tinted and my car is black so at night i doubt other cars can see me.

Thanks in advance for the help guys.

 

So turn signals and brake lights work but no constant lights, do they have connectors on them, did you have to cut anything? Bulbs might be bad or if it is a connector you might have a bent/bad pin in there that isn't making contact. I would check to make sure they are dual filament bulbs, good luck.