LED Gurus I got a question

[chevyguy_72]

I bought some plain 2 wire round LEDs from a place that sell semi stuff. If i hook them up to the turn signal wires one way they work as turn signals when the headlights are off but not if the HLs are on. If i reverse the polarity it is the opposite. (they work as parking and turns when the HLs are on but not at all when they are off)
I do not have a LED flasher unit and this is my only idea but does not sound like an answer to me.
Thanks in advance for any help