timberwolffxdl

Interesting. Everything I read said the LTZ and HC were the only ones with LED in the HD models in those years. And the lights I bought (aftermarket) specifically state 2016-19 fitment for 2500/3500 HD, only for trucks with OEM LED lights. Thanks for the link! I'll look into it more

but the harness on the truck side appears to be GM made. Is it possible someone bought a non LED harness and plugged it in under the truck in order to use the aftermarket lights? Would that even work that way? If, then I would think I should be able to find a factory LED harness and just swap it back to original

My understanding was that all LTZ of my year (2017) had LED tail lights from the factory. My truck had aftermarket LEDs installed by a previous owner. The left was giving me an error for having a turn signal out. I bought new ones, that are for trucks with factory LEDs. But... the tai light harness is wrong. It looks like the truck end of the harness is setup for standard 3357 (or similar) type bulbs. First pic is the aftermarket LED, second is the truck harness, third is the new tail light assembly harness. and yes... I confirmed this is an LTZ both with the original window sticker and the RPO sticker. Any reason why the truck would have a standard socket-style harness?

Thanks! Unfortunately I don't have the stock tail lights, just the ones in the pic I posted. So I had no comparison to make. Just the research that says LTZ had the LED tails

Hi all, new here. Just bought the truck. It has aftermarket tail lights. From what I've read here, the LTZ would have the LED tail lights originally. And this is a 100% of the time case? I have one of the aftermarkets on the fritz, and new ones ask if the truck was originally LED or not.