DIY request: which wire to splice the switchback side marker relay wire to

Hey. I got the switchback side markers (smoked) that use LEDs and a relay. By default, just plugging in the side markers lights up the side markers Orange at night and they're off during the day. It has a green wire coming out that acts as a relay.

The relay is supposed to turn on the white LEDs during the daytime, and I think they're supposed to make the LEDs turn off/on with the blinker.

Anyone know what wire I would splice/tap into to make that relay turn the white markers on during the day?