The Tekonsha T-One Vehicle Wiring Harness # 118252 does not include dielectric grease, unfortunately. With that said, you will want to grab a tube of # LT37534 to go along with this harness, if you do not already have some.
Just to confirm as well, this harness will fit a 2010 to 2018 Lexus RX 450h with the factory Tow Package, so you will have no issues with your 2011. I included an install video of this going onto a 2011 RX 350 as we do not have one with an RX 450h as of yet, but the... view full answer...
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