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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K
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Kris Nicholas
New York, US
★★★★★ 5
They Fixed My Boat
Size: PP67-712 V1
My boat wouldn’t start, and the outdrive wouldn’t go up or down. So I bought three of these solenoids and replaced the starter and both trim motor solenoids/relays. Now it starts right up with no problems and the trim motor is working again also. I have a 2006 Stingray boat.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 7, 2022
J
Verified Purchase
Josh T.
Cuba, US
★★★★★ 1
Poor quality
Size: PP67-712 V1
Poor quality. Replaced a starter solenoid on a mercruser 4.3. Right off install it would click but not make a connection to start motor. Confirmed this was the culprit by jumping the terminals. After testing multiple times found it worked a little less than half the time.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 29, 2026
E
Verified Purchase
Erin
Louisville, US
★★★★★ 5
Thick wires
Size: 4/0AWG, Color: 10ft Black + 10ft Red
Heavy duty for my solar set up. These wires are thick. I've never used such thick wires for anything. Now I know why they're so expensive. There was some weight to these wire too. The diameter is larger than a dime. These are some serious wire.
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Reviewed in the United States on December 25, 2025
O
Verified Purchase
OneShopStop88
Bozeman, US
★★★★★ 5
Monster cable
Size: 4/0AWG, Color: 3ft Black + 3ft Red
Well I now know what 4/0 or 0000 cable is. Huge but very easy to handle or bend to shape.
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Reviewed in the United States on January 13, 2026
B
Verified Purchase
bmo37
Alexandria, US
★★★★★ 5
Used for my rv battery bank
Size: 4/0AWG, Color: 3ft Black + 3ft Red
Good quality used these for my battery bank on my rv solar setup.
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Reviewed in the United States on December 1, 2025

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