2023 Sierra SLT 1500 taillight UPGRADE to 2024 Sierra 2500 HD

Frankielozano214 · October 11

Just bought a set of 2024 Sierra 2500 HD taillights was wondering if anybody on here has done this conversion yet, the plugs are different and I don’t have the harness to the 2024 lights. I have talked to a guy that sells an adapter to make them work with the 2023 harness but it’s like 300$ will keep yall posted on this, (will be selling these once I buy a set of 2024 AT4 2500 HD taillights looking for the ones with the clear lens ) also selling my factory LED Denali/SLT taillights too

Edited October 11 by Frankielozano214

Frankielozano214 · October 12

Ordered my harness should be here in a bout a week, can’t wait to test them out and get rid of these regular Denali tails.

Frankielozano214 · Saturday at 11:20 PM

So I got my custom harness (280$) for the taillight but I didn’t have the OEM harness for each taillight (ordered off ebay for 77$ for the pair) dealer wanted 125$ each harnesses

custom harness below plugs to the body harness and OEM harnesses plug to the custom harness , the yellow goes to the power wire on trailer plug

here’s the OEM taillight harness order 2 below

thought I had everything but was missing the taillight harness’s

Just a view of them next to each other

Edited Saturday at 11:21 PM by Frankielozano214

Frankielozano214 · Tuesday at 11:28 PM

Finally got them installed yes they fit without modification, so have a minor issue when turn signals are on and pressing the brake they start to hyperflash, when I release the brake ped they flash normal. Dude is gonna check his wiring and check my wires via the vin from my truck and let me know something here tomorrow hopefully