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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Gary Watkins
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★★★★★ 5
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Excellent line of products. Looking at the picture, you can see what the camper looked like before the Poli Glow. To the left of the window is the after Poli Glow. It takes some elbow grease (follow instructions well) but well worth it.
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Reviewed in the United States on May 26, 2026
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East Coast Curt
Waukegan, US
★★★★★ 5
Camping enthusiast approved
One bottle covered my 20ft camping trailer 4 coats and with a little remaining for future touch ups. It definitely increases the gloss. I'm glad I didn't waste my time with wax. This is like an easy wipe on clear coat. I will report back in the future for longevity.
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Reviewed in the United States on May 24, 2026
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Amazon Customer
Natrona Heights, US
★★★★★ 4
buy more than you think your going to need to get a great shine and look!!
great product and leaves a great shine. The Poli Glow doesn't go as far as the video states and it depends on condition of RV, boat...This is a great product but takes more to get a great shine!!
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Reviewed in the United States on April 16, 2026
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handfree
Fort Morgan, US
★★★★★ 5
poli glow shine
its works great .when applying more coats the shinier it gets i used on several old boats because the florida sun bakes the jell coat right off and no wax made can withstand salty seas , so why not ,, when you apply use the mit and don't gob it on .. nice and easy and recoat in five minutes when you get to about five coats you will be amazed.looks like new .. just a tip also after about a year or so and you want to re apply,, go to your local hardware store and get a gallon of high strength or non diluted floor stripper and put in spray bottle and use to remove old poli-glow also great for cleaning stubborn stains [ i use full strength ] just spray on and brush with a scrub brush and rinse ..and let dry and re apply ,, its also works on car faded bumpers ,, also never use harsh cleaners it will cause streaking the best thing i have found for cleaning the boat after poli glow was put on is car wash from auto store with wax or not it seems not to hurt the shine . it reminds me of mop an glow,,.
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Reviewed in the United States on November 29, 2020
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Kevin H.
Grantham, US
★★★★★ 5
RV owner.
Excellent product. Delivers the shine and protection as advertised.
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Reviewed in the United States on May 21, 2026

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