So i got new tail lights. They all work but... The end ones work fine.

Heres my problem, when i plug both new trunk lid ones, they dont light. If i keep one new one plug in and then plug my stock light up they bolth light up fine. Then when i un plug the stock light, the new one goes out.. Any suggestions?

 

i found out that they are my reverse lights. so my trunk lid lights only light up when in reverse.