So my 2016 300s 5.7 just received substantial front end damage resulting in basically everything from the belt of the engine towards the bumper needs replaced. Motor trans radio air all works but I need to replace bumper lights radiator intake coolant and all that. I plan on buying a ‘16 300s 3.6 as a parts car instead of buying individual parts but my concern is the harness that the lights are connected with. Can I use the harness from the 3.6 on the 5.7? Or do I need a 5.7 parts car because the car I’m looking to buy has it all, in good shape, and the same color code all around.

 

You kind of answered our own question... lol
If your needing everything from the belt forward, then you need the 5.7 hardwear.... And with the 5.7 car will have most of what you need.... Good Plan....
As for the 3.6 Harness on the front of the car... I would think that most of it should be close to the same.... Should have enough to splice it together...
Good Luck... Keep us posted... Cheers