SieClan Yukon

Yes. With switch turned on I have constant power on 309 GY/BN wire at the plug. I need to get a meter to check voltage. Everything but the park light works on both tail lights.

Have a 17 Yukon with the common tail light issue. Purchased new tail lights and the same thing no running/park light on passenger side. Verified with known working oem drivers side same thing. Tried using a test light gray/brown wire was repaired at some point and has power at the pin. Is there a separate ground for the park lights or something else that would not complete the circuit for just the park light?