SKU: 50627001278

SW1951C Starter Solenoid Relay for Ford F150 F250 F350 F450 Escort Bronco Mustang Ranger & Mercury & Lincoln - E5TZ-11450-A E9TZ-11450-B SW1951

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Description

SW1951C Starter Solenoid Relay for Ford F150 F250 F350 F450 Escort Bronco Mustang Ranger & Mercury & Lincoln - E5TZ-11450-A E9TZ-11450-B SW1951SW1951C Heavy Duty Starter Solenoid Relay Key Features High Current Copper Terminals: Equipped with premium copper contact studs that ensure maximum electrical conductivity and minimal voltage drop during high amp cold starts. Heavy Duty Solenoid Coil: Features an upgraded internal winding designed to operate reliably under extreme under hood temperatures and high vibration off road conditions. Phenolic Molded Housing: Constructed from high

SW1951C Heavy Duty Starter Solenoid Relay

Key Features

  • High-Current Copper Terminals: Equipped with premium copper contact studs that ensure maximum electrical conductivity and minimal voltage drop during high-amp cold starts.
  • Heavy-Duty Solenoid Coil: Features an upgraded internal winding designed to operate reliably under extreme under-hood temperatures and high-vibration off-road conditions.
  • Phenolic Molded Housing: Constructed from high-temperature phenolic plastic to resist cracking, moisture intrusion, and electrical tracking between terminals.
  • Universal 4-Terminal Interface: Includes two primary battery/starter studs and two small signal terminals (S and I), maintaining the classic Ford electrical layout for easy wiring.
  • Direct OE-Spec Fitment: Designed with the standard vertical mounting bracket and hole spacing found on Ford trucks and cars from the 1980s through the early 2000s.

Replaces / Cross-Reference Part Numbers

  • Ford: E5TZ-11450-A, E7TZ-11450-A, E9TZ-11450-B, F5TU-11450-BA
  • Motorcraft: SW1951, SW1951A, SW1951C
  • Other: 6012928, B6AZ-11450-A, F1491, SS581

Compatibility & Fitment

This solenoid is the "classic" fender-mounted relay used across decades of Ford, Lincoln, and Mercury vehicles. Key compatible models include:

  • Ford F-Series: F-150, F-250, F-350, F-450, F-550 (including Super Duty models up to the early 2000s).
  • Ford Trucks & SUVs: Ranger, Bronco, Explorer, Expedition, Excursion.
  • Ford Vans: E-150, E-250, E-350, E-450 Econoline series.
  • Ford Cars: Mustang, Crown Victoria, Escort, Taurus, Thunderbird.
  • Lincoln & Mercury: Town Car, Grand Marquis, Navigator, Mountaineer.

When to Replace

  • The "Clicking" Sound: You hear a single, sharp click when turning the key, but the starter motor does not engage.
  • Intermittent Starting: The vehicle starts fine one moment but refuses to turn over the next, often requiring a "tap" on the solenoid to work.
  • Starter Stays Engaged: The starter motor continues to spin even after the engine has started and the key is released (indicates the internal contacts have "welded" shut).
  • No Sound at All: Turning the key results in total silence, suggesting the internal solenoid coil has failed or is not receiving the signal.
  • Corroded Terminals: The copper studs have become heavily oxidized or the mounting bracket is rusted, preventing a solid ground connection to the fender.

Installation Tips

  • Battery Disconnect: Always disconnect the Negative (-) 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.
  • Grounding is Key: This relay grounds through its metal mounting bracket. Ensure the fender area where it bolts on is clean and free of paint, rust, or debris to ensure a solid electrical circuit.
  • Terminal Orientation: 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.
  • Avoid Over-tightening: 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.
  • Safety Check: After installation, ensure all wires are clear of moving parts like the fan or hot exhaust manifolds.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 50627001278

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Tammy Lee Morris
Phoenix, US
★★★★★ 1
Don’t waste your money or time!
Color: White, Size: Standard - 4 Panel
Don’t waste your money. The instructions make no sense and the metal poles are either sized wrong for the product or screw holes are incorrectly placed, but no two poles matched in size and placement making it impossible to put this together without the panels being warped. No matter how I tried to switch the poles to see if I had them wrong, they always turned out warped and incorrectly fit. I finally gave up and threw everything out - I wasted $50 on this junk and because I didn’t try to put it together immediately after I bought it, it is way too late for a refund. Lesson learned!
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Reviewed in the United States on October 1, 2025
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Edward Hugee
Battle Creek, US
★★★★★ 3
Sturdiness
Color: Black, Size: Standard - 4 Panel
Not so sturdy. It worked well for its intended job, but, it has to be secured to the floor for long term use.
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Reviewed in the United States on March 30, 2026
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Edith Appleton
Chelsea, US
★★★★★ 5
Hide my hot water heater
Color: Grey, Size: Standard - 4 Panel
I used the divider to hide my hot water heater. It's perfect and looks great
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Reviewed in the United States on April 21, 2026
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Janet Lanier
San Leandro, US
★★★★★ 4
Wobbly but Usable
Color: Grey, Size: Standard - 4 Panel
A bit wobbly, but good enough for the price when you need a solid background for remote work calls.
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Reviewed in the United States on May 6, 2026
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Lateefah
Natrona Heights, US
★★★★★ 5
Nice and easy to assemble
Color: Black, Size: Standard - 4 Panel
I absolutely love this 4-panel room divider! It was super easy to assemble — I had it set up in just a few minutes. The material isn’t too see-through, which gives just the right amount of privacy while still letting some light through. It does exactly what I needed it to do and looks so clean and sleek in my space. Perfect balance of style and function — highly recommend!
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Reviewed in the United States on November 7, 2025

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