Trailer Wiring Harness Installation - 2010 Toyota Highlander How to Install a Trailer Wiring Harness on a 2010 Toyota Highlander. Today on this 2010 Toyota Highlander we are going to be installing wiring harness part number 118449. The first thing I want to point out about our harness is that it comes in two separate pieces.4.9/5(431) 2010 Toyota Highlander Trailer Wire Harness and Connector Equip cars, trucks & SUVs with 2010 Toyota Highlander Trailer Wire Harness and Connector from AutoZone. Get Yours Today! We have the best products at the right price.
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