Led turn signal wiring question

I've been helping a buddy wire in led turn signals on a 98 tj. He add the ep26 flasher like he should. Everything works fine when his head lights are off but as soon as he turns on his lights his turn signals won't work. I've searched and found others with the same problem but I couldn't find a solution. On the fronts he has the parking light wire capped off so he's only using the led light as a turn signal.

Black wire on led hooked to black wire

Black/yellow capped off

Red led wire hooked to tan wire



Any suggestions ?