Amazon: GM Genuine (23455107) Trailer Wiring Harness See and discover other items: gm wiring harness, trailer wiring harness, trailer harness, trailer wiring, Best wiring harness for trailers, Best wiring harness for trailer Set up an Amazon Giveaway Amazon Giveaway allows you to run promotional giveaways in order to create buzz, reward your audience, and attract new followers and customers.4.1/5(6)Price: $81 Amazon: gm trailer wiring harness Genuine GM 25910884 Trailer Wiring Harness. 5.0 out of 5 stars 3. $50 $ 50. 05. Get it as soon as Mon, Jun 24. FREE Shipping by Amazon. Only 4 left in stock (more on the way). More Buying Choices $47 (8 new offers) GM Genuine (23455107) Trailer Wiring Harness. 4.1 out of 5 stars 6.