WirthCo 80911 4-Way Trailer Connector Test Light

WirthCo

<h3>About WirthCo Engineering</h3><p>For nearly four decades, <strong>WirthCo Engineering, Inc.</strong> has built a reputation as one of the automotive aftermarket's most innovative manufacturers. Headquartered in Minneapolis, Minnesota, WirthCo designs and markets a wide range of automotive accessories, industrial safety products, and maintenance solutions — engineered to make life easier and safer whether you're on the road, at the worksite, in the campground, or out on the water.</p><p>What sets WirthCo apart is its commitment to original innovation. The company holds over 36 patents across its product line, and it manufactures or directly sources approximately 75% of its own catalog — a level of vertical control that translates into consistent quality and purpose-built design. That engineering-first philosophy is evident in every product category the company touches.</p><h3>Battery Doctor® – A Trusted Name in Battery Care</h3><p>WirthCo's most recognized brand identity is <strong>Battery Doctor®</strong>, a comprehensive line of battery management accessories. From <a href="/1894-wirthco-battery-chargers-200141">battery chargers</a> and battery maintainers to disconnect switches, isolators, monitors, and testers, Battery Doctor® products are designed to extend battery life and protect electrical systems in cars, trucks, RVs, boats, and more. Whether you're maintaining a daily driver or storing a seasonal vehicle, these tools help ensure reliable starts and healthy charging cycles.</p><p>WirthCo also carries a complete range of <a href="/1894-wirthco-vehicle-battery-2476">vehicle batteries</a> suited for a variety of automotive applications, rounding out a one-stop solution for battery-related needs.</p><h3>Fluid Handling – Drain Pans and Funnels</h3><p>Fluid management is another area where WirthCo's practical engineering shines. The brand's <a href="/14675-drain-pan-wirthco-1894">drain pans</a> are a staple for DIY mechanics and professional shops alike — built to handle oil changes, coolant drains, and other fluid collection tasks cleanly and efficiently. Durable construction and thoughtful design details like pour spouts and carry handles make these pans genuinely useful in real-world garage conditions.</p><p>Complementing the drain pan lineup is WirthCo's selection of <a href="/1894-wirthco-multi-purpose-funnel-14561">multi-purpose funnels</a>. These aren't throwaway accessories — WirthCo's funnels are engineered for a range of fluids and vehicle types, with features that reduce spills and simplify fluid top-offs in tight engine bays.</p><h3>Visibility and Safety</h3><p>WirthCo's dedication to safety extends beyond the garage. The brand's <a href="/1894-wirthco-roof-marker-light-10052">roof marker lights</a> provide high-visibility signaling for trucks, vans, and commercial vehicles — a practical safety solution for fleet operators and working professionals who need reliable, regulation-compliant lighting on larger vehicles.</p><h3>Why Choose WirthCo?</h3><ul style="list-style:disc"><li><strong>36+ patents</strong> reflecting a genuine culture of innovation</li><li><strong>~75% proprietary manufacturing</strong> for consistent quality control</li><li>Products spanning automotive, marine, RV, industrial, and home use</li><li>Trusted Battery Doctor® brand with a full ecosystem of battery accessories</li><li>Decades of expertise in automotive aftermarket and safety products</li></ul><p>From the driveway to the jobsite, WirthCo Engineering continues to deliver practical, well-engineered products that professionals and enthusiasts rely on every day.</p>