Signal lights.

[psoucy]

I am wiring my led tail lights and the signal lights work when the headlights are off. When the headlights are on the signal lights don’t work, I can hear the flasher going off though. I hard wired the tail lights because the sockets were rotted. I connected the yellow wire to the to the signal light wire, the red wire to the the brown wire/constant power from headlight switch and then black wire to ground. Is it a wiring issue or a bad signal switch in the steering column. Or am I missing something.