{"product_id":"dorman-diesel-glow-plug-relay-904-194-direct-fit-replacement-durable-electrical-switching-for-cold-starts","title":"Dorman Diesel Glow Plug Relay 904-194 — Direct-Fit Replacement, Durable Electrical Switching for Cold Starts","description":"\u003cp\u003e\u003cstrong\u003eThe Dorman 904-194 Diesel Glow Plug Relay is a direct-fit replacement relay that controls current to diesel glow plugs for dependable starting performance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your diesel engine shows slow or difficult cold starts, a worn or failed glow plug relay can be the cause. The Dorman 904-194 is built to match the original relay’s fit and electrical function, offering a straightforward repair option that restores proper glow plug operation without the need for modifications.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this relay restore proper glow plug function?\u003c\/h3\u003e\n\u003cp\u003eReplacing a faulty relay with the Dorman 904-194 re-establishes the intended control of current to the glow plugs, ensuring they heat at the right times and durations. That helps the engine reach ignition temperature more consistently during cold conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement design for original-fit installation\u003c\/li\u003e\n  \u003cli\u003eControls current delivery to glow plugs according to vehicle signals\u003c\/li\u003e\n  \u003cli\u003eManufactured from durable electrical components to reduce premature failure\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat vehicles and situations is this relay meant for?\u003c\/h3\u003e\n\u003cp\u003eThe Dorman 904-194 is produced as an aftermarket substitute for specific diesel vehicle applications—verify compatibility before purchasing. It’s intended for cars and trucks whose original relay has failed, become intermittent, or shows electrical wear.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned to match OEM fit and function for specified models\u003c\/li\u003e\n  \u003cli\u003eIdeal when the original relay is damaged, corroded, or unreliable\u003c\/li\u003e\n  \u003cli\u003eUse the vehicle lookup (make, model, trim) to confirm fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow reliable and long-lasting is this replacement relay?\u003c\/h3\u003e\n\u003cp\u003eDorman constructs the 904-194 from quality materials and subjects it to product testing to meet standards for aftermarket parts. While longevity depends on operating conditions, the relay’s sturdy components aim to deliver stable performance over many cycles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDurable construction for consistent electrical switching\u003c\/li\u003e\n  \u003cli\u003eAssembled and supported by Dorman’s product specialists\u003c\/li\u003e\n  \u003cli\u003eBacked by decades of aftermarket automotive experience\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know about installation and fitment?\u003c\/h3\u003e\n\u003cp\u003eInstallation is intended to be a direct swap with the original relay—no modifications normally required. Still, always check electrical connectors, mounting points, and vehicle-specific instructions before beginning the replacement.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement—matches factory relay’s size and terminals\u003c\/li\u003e\n  \u003cli\u003eConfirm fit by entering your vehicle details in the fitment tool\u003c\/li\u003e\n  \u003cli\u003eInspect wiring and grounding points during installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Dorman 904-194 Diesel Glow Plug Relay is suited for DIY mechanics and professional technicians who need an economical, OEM-style relay replacement for compatible diesel vehicles. Choose this part if you require a like-for-like relay to resolve glow plug heating issues, improve cold-start reliability, or replace an aging component with a tested aftermarket option.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eFeatures recap:\u003c\/em\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement designed to match original relay fit and function\u003c\/li\u003e\n  \u003cli\u003eReliable solution for relays damaged or failed due to fatigue\u003c\/li\u003e\n  \u003cli\u003eDurable construction using quality components for long service life\u003c\/li\u003e\n  \u003cli\u003eBacked by product experts and extensive automotive experience\u003c\/li\u003e\n  \u003cli\u003eUse the vehicle garage tool to confirm exact fit for your make and model\u003c\/li\u003e\n\u003c\/ul\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: Will the Dorman 904-194 fit my vehicle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Check compatibility by entering your vehicle’s make, model, and trim in the fitment tool; it’s a direct-fit for specified diesel models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install this relay myself?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—installation is typically a direct swap, but inspect connectors and wiring and follow vehicle-specific procedures.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":48084100972702,"sku":"B00Z7O8YHA","price":66.17,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/dorman-relay-front-view.jpg?v=1785846430","url":"https:\/\/northtrailauto.ca\/products\/dorman-diesel-glow-plug-relay-904-194-direct-fit-replacement-durable-electrical-switching-for-cold-starts","provider":"North Trail Auto","version":"1.0","type":"link"}