Jeep Wiring Harnesses | Quadratec Whether you're completely re-wiring a Jeep, or just adding a few accessories, a pre-made wire harness can make the job much easier, and more professional looking when you're done. Painless wiring offers both universal kits and Jeep model specific kits so you can get your entire Jeep wired. Jeep Grand Cherokee ZJ 1993 to 1998 How to Install Trailer Jeep Grand Cherokee 1993-1998: How to Install Trailer Wiring Harness. This article will provide you with a step-by-step walkthrough for installing a trailer wiring harness. By Jared Hammond - September 24, 2015 This article applies to the Jeep Grand Cherokee ZJ (1993-1998). So, you've got yourself a trailer as well as hitch all set up and readywiring - Jeep Cherokee Forum - Threads Tagged with wiringMay 03, 2016Jeep Grand Cherokee 1999-2004: Tail/Brake Light Problems Jeep Grand Cherokee 1999-2004: How to Replace Tail Light Bulbs Jeep Grand Cherokee ZJ 4WD Problems, Repair How Tos See more results Home | E Z Wiring | Florida USA At EZ Wiring, we strive to bring you the best harness for the best price. Our harnesses are universal and can fit just about any application. We use top quality gxl cross linked polyethylene jacketed wire to resist heat, oil and water. Every wire in each kit is labeled every 5 inches to make your installation as easy as possible.