{"product_id":"lifetime-warranty-sw1951c-heavy-duty-starter-solenoid-relay-compatible-with-ford-f150-f250-f350-f450-f550-e150-e250-e350-escort-bronco-mustang-ranger-mercury-lincoln-e5tz11450a-e9tz11450b-sw1951","title":"[Lifetime Warranty] SW1951C Heavy Duty Starter Solenoid Relay - Compatible with Ford F150 F250 F350 F450 F550 E150 E250 E350 Escort Bronco Mustang Ranger \u0026 Mercury \u0026 Lincoln - E5TZ-11450-A E9TZ-11450-B SW1951","description":"\u003ch2\u003eSW1951C Heavy Duty Starter Solenoid Relay\u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Current Copper Terminals:\u003c\/strong\u003e Equipped with premium copper contact studs that ensure maximum electrical conductivity and minimal voltage drop during high-amp cold starts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty Solenoid Coil:\u003c\/strong\u003e Features an upgraded internal winding designed to operate reliably under extreme under-hood temperatures and high-vibration off-road conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhenolic Molded Housing:\u003c\/strong\u003e Constructed from high-temperature phenolic plastic to resist cracking, moisture intrusion, and electrical tracking between terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal 4-Terminal Interface:\u003c\/strong\u003e Includes two primary battery\/starter studs and two small signal terminals (S and I), maintaining the classic Ford electrical layout for easy wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect OE-Spec Fitment:\u003c\/strong\u003e Designed with the standard vertical mounting bracket and hole spacing found on Ford trucks and cars from the 1980s through the early 2000s.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFord:\u003c\/strong\u003e E5TZ-11450-A, E7TZ-11450-A, E9TZ-11450-B, F5TU-11450-BA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotorcraft:\u003c\/strong\u003e SW1951, SW1951A, SW1951C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther:\u003c\/strong\u003e 6012928, B6AZ-11450-A, F1491, SS581\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThis solenoid is the \"classic\" fender-mounted relay used across decades of Ford, Lincoln, and Mercury vehicles. Key compatible models include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFord F-Series:\u003c\/strong\u003e F-150, F-250, F-350, F-450, F-550 (including Super Duty models up to the early 2000s).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFord Trucks \u0026amp; SUVs:\u003c\/strong\u003e Ranger, Bronco, Explorer, Expedition, Excursion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFord Vans:\u003c\/strong\u003e E-150, E-250, E-350, E-450 Econoline series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFord Cars:\u003c\/strong\u003e Mustang, Crown Victoria, Escort, Taurus, Thunderbird.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLincoln \u0026amp; Mercury:\u003c\/strong\u003e Town Car, Grand Marquis, Navigator, Mountaineer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe \"Clicking\" Sound:\u003c\/strong\u003e You hear a single, sharp click when turning the key, but the starter motor does not engage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntermittent Starting:\u003c\/strong\u003e The vehicle starts fine one moment but refuses to turn over the next, often requiring a \"tap\" on the solenoid to work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStarter Stays Engaged:\u003c\/strong\u003e The starter motor continues to spin even after the engine has started and the key is released (indicates the internal contacts have \"welded\" shut).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Sound at All:\u003c\/strong\u003e Turning the key results in total silence, suggesting the internal solenoid coil has failed or is not receiving the signal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorroded Terminals:\u003c\/strong\u003e The copper studs have become heavily oxidized or the mounting bracket is rusted, preventing a solid ground connection to the fender.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Disconnect:\u003c\/strong\u003e Always disconnect the \u003cstrong\u003eNegative (-)\u003c\/strong\u003e battery cable before starting. This solenoid is connected directly to the \"hot\" side of the battery and can cause a massive short if accidentally grounded.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding is Key:\u003c\/strong\u003e This relay grounds through its \u003cstrong\u003emetal mounting bracket\u003c\/strong\u003e. Ensure the fender area where it bolts on is clean and free of paint, rust, or debris to ensure a solid electrical circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Orientation:\u003c\/strong\u003e Note the \"S\" and \"I\" markings on the small terminals. The \"S\" terminal (Start) receives power from the ignition switch, while the \"I\" terminal (Ignition) provides a bypass to the coil during cranking on older points-based systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvoid Over-tightening:\u003c\/strong\u003e The large copper studs are seated in plastic. Use a back-up wrench if possible to avoid twisting the internal contacts while tightening the main battery cables.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Check:\u003c\/strong\u003e After installation, ensure all wires are clear of moving parts like the fan or hot exhaust manifolds.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":46495303499965,"sku":"AZ33590939","price":19.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00207526_1.jpg?v=1773213041","url":"https:\/\/bluestarsparts.com\/products\/lifetime-warranty-sw1951c-heavy-duty-starter-solenoid-relay-compatible-with-ford-f150-f250-f350-f450-f550-e150-e250-e350-escort-bronco-mustang-ranger-mercury-lincoln-e5tz11450a-e9tz11450b-sw1951","provider":"BlueStars Parts","version":"1.0","type":"link"}