{"product_id":"czc-auto-25ft-4-pin-5-wire-trailer-wiring-harness-18-awg-pure-copper-nylon-sleeve-for-dual-taillights","title":"CZC AUTO 25ft 4‑Pin 5‑Wire Trailer Wiring Harness — 18 AWG Pure Copper, Nylon Sleeve for Dual Taillights","description":"\u003cb\u003eCZC AUTO's 25-foot 4-pin 5-wire trailer wiring harness is a pre-assembled Y-harness with 18 AWG pure copper conductors, nylon protective sleeve and PVC jacket designed to rewire trailer taillights and feed dual side taillights without extra splicing.\u003c\/b\u003e\n\nRewiring a trailer can be messy and time-consuming; this kit simplifies the job by combining a 4-way flat connector with a built-in 5-wire Y harness so both left and right taillights get power from a single 4-pin socket. The harness uses color-coded conductors, heavy-gauge copper, and layered protection—PVC insulation plus a black nylon mesh sleeve—so installations stay tidy and hold up to road wear, salt, and basic abrasion. With 25 feet of main wire and a 2.5-foot ground lead, it works for small to large trailers and includes a dust cap to protect the plug when it’s not in use.\n\n\u003ch3\u003eHow does this harness make rewiring faster and cleaner?\u003c\/h3\u003e\n\u003cp\u003eThe built-in Y (wishbone) layout eliminates the need to splice a separate wire to feed both taillights, cutting install time and reducing failure points. Color-coded wires match standard trailer wiring conventions so you can identify functions quickly. The outer nylon sleeve keeps the bundle neat and resists chafing in tight or moving mounting locations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePreassembled Y-harness: no separate splicing for dual taillights\u003c\/li\u003e\n  \u003cli\u003eColor-coded conductors: quick identification of signals\u003c\/li\u003e\n  \u003cli\u003eNylon mesh sleeve: organized bundle and abrasion resistance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill the materials last through salt, road debris, and normal wear?\u003c\/h3\u003e\n\u003cp\u003eThe conductors use 18 AWG pure copper for consistent electrical conductivity, while each wire is insulated with thick PVC to resist cracking and moisture ingress. Over that, a black nylon mesh sleeve adds a physical barrier against abrasion and abrasion-induced failures. The 4-way plug has a dust cover to reduce corrosion when the trailer is idle.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e18 AWG pure copper cores: reliable conductivity\u003c\/li\u003e\n  \u003cli\u003eThick PVC insulation: moisture and wear resistance\u003c\/li\u003e\n  \u003cli\u003eBlack nylon sleeve: extra protection from abrasion and chafing\u003c\/li\u003e\n  \u003cli\u003eDustproof plug cover: limits corrosion when unused\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs the length and wiring layout suitable for different trailer types?\u003c\/h3\u003e\n\u003cp\u003eThe harness offers a 25-foot main lead and a 2.5-foot ground wire, providing enough reach for trailers both under and over 80 inches wide and giving installers flexibility in routing. The 4-way flat plug fits standard 4-pin sockets found on boat trailers, ATV trailers, horse trailers and many utility trailers. Because it’s a 5-wire harness wired into a 4-pin plug, it allows for dual side taillights without converting to a 7-pin system.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e25-foot main length: accommodates most trailer lengths and mounting points\u003c\/li\u003e\n  \u003cli\u003e2.5-foot ground: extra slack for secure grounding locations\u003c\/li\u003e\n  \u003cli\u003eStandard 4-way flat connector: wide compatibility with existing sockets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat tools or skills are needed to install this kit?\u003c\/h3\u003e\n\u003cp\u003eBasic hand tools and a working knowledge of trailer light wiring are sufficient for most installs: cut, strip, crimp or solder connections, and secure the harness to the trailer frame. Color-coded wiring reduces guesswork; you may want dielectric grease on connector pins for long-term corrosion protection. If you prefer not to join wires manually, a professional installer can complete the job quickly thanks to the harness layout.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTools: wire cutter\/stripper, crimper or soldering iron, heat shrink or butt connectors\u003c\/li\u003e\n  \u003cli\u003eOptional: dielectric grease for connector longevity\u003c\/li\u003e\n  \u003cli\u003eTime: typically under an hour for experienced DIYers\u003c\/li\u003e\n\u003c\/ul\u003e\n\nWho is this for?\n\u003cp\u003eThis CZC AUTO harness is aimed at DIY trailer owners, boaters, small-fleet operators and repair shops that need a clean, durable solution for feeding left and right taillights from a 4-way flat socket. It’s especially useful when you want to avoid adding extra splices, tidy up an old wiring job, or upgrade wiring durability without converting to a 7-pin system.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this harness fit standard 4-way trailer sockets?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit uses a standard 4-way flat connector compatible with most 4-pin trailer sockets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this harness for boat trailers exposed to saltwater?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. PVC insulation and the nylon sleeve reduce moisture and abrasion; use dielectric grease on pins for extra corrosion resistance.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"CZC AUTO","offers":[{"title":"Default Title","offer_id":48084513423518,"sku":"B0DQ7QPWFH","price":31.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/czc-auto-front-connector-4-way-flat.jpg?v=1785858292","url":"https:\/\/northtrailauto.ca\/products\/czc-auto-25ft-4-pin-5-wire-trailer-wiring-harness-18-awg-pure-copper-nylon-sleeve-for-dual-taillights","provider":"North Trail Auto","version":"1.0","type":"link"}