[Lifetime Warranty] 12V Heavy Duty SW3 Hot Rod Starter Solenoid SS581T/ ALL7620
12V heavy duty hot rod starter solenoid with red housing and mounting bracket.
12V heavy duty SW3 hot rod starter solenoid with red housing and metal mounting bracket.
Infographic showing construction details of 12V heavy duty SW3 hot rod starter solenoid with copper coil and terminals.
Four views of a 12V heavy-duty SW3 hot rod starter solenoid showing mounting brackets and terminal connections.
Infographic showing wide application of 12V heavy duty starter solenoid for cars, marine, motorhomes, and tractors.
Wiring diagram for 12V heavy duty hot rod starter solenoid showing S and I terminal connections.
12V heavy duty SW3 starter solenoid for hot rod applications shown in a lifestyle marketing graphic.
12V heavy duty hot rod starter solenoid with red housing and mounting bracket.
12V heavy duty SW3 hot rod starter solenoid with red housing and metal mounting bracket.
Infographic showing construction details of 12V heavy duty SW3 hot rod starter solenoid with copper coil and terminals.
Four views of a 12V heavy-duty SW3 hot rod starter solenoid showing mounting brackets and terminal connections.
Infographic showing wide application of 12V heavy duty starter solenoid for cars, marine, motorhomes, and tractors.
Wiring diagram for 12V heavy duty hot rod starter solenoid showing S and I terminal connections.
12V heavy duty SW3 starter solenoid for hot rod applications shown in a lifestyle marketing graphic.
Lifetime Warranty

[Lifetime Warranty] 12V Heavy Duty SW3 Hot Rod Starter Solenoid SS581T/ ALL7620

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12V Heavy Duty SW3 Hot Rod Starter Solenoid SS581T/ ALL7620

Key Features

  • Operating Voltage: 12V DC
  • Terminal Configuration: Standard SW3 style
  • Function: Relays high-current electrical power from the battery to the starter motor
  • Construction: Heavy-duty design for high-amperage applications and durability
  • Application: Suitable for use with remote start switches and timing lights

Replaces / Cross-Reference Part Numbers

  • SS581T
  • ALL7620
  • ALL76203
  • 2700006
  • 2900550
  • B4TZ-11002-A
  • B6A-11002A
  • B-6A-11450A
  • C6AF
  • C7AF
  • C9AF
  • F496
  • SS588
  • 66-200

Compatibility & Fitment

  • Commonly used in hot rods, custom vehicle builds, and heavy-duty applications.
  • Fits various Ford models including 2000, 3000, and 4000 series tractors (1956 and newer).
  • Compatible with select Ford Bronco, Mercury, and Evinrude applications.
  • Note: Always verify fitment by cross-referencing your original part number.

When to Replace

  • Engine fails to crank or makes a single, loud clicking sound when the ignition is turned.
  • Intermittent starting issues where the vehicle sometimes starts and sometimes does not.
  • The starter motor continues to run after the engine has started.
  • No sound or action from the starter when the ignition key is in the start position.

Installation Tips

  • Always disconnect the negative battery terminal before starting work.
  • Take a photo or label the wires connected to the old solenoid to ensure correct placement on the new unit.
  • Clean all wire terminals and connection points to ensure a solid electrical contact.
  • Securely mount the new solenoid in the original location, away from excessive engine heat or direct moisture.

FAQ

This 12V heavy-duty solenoid is a universal fit for a wide range of 1956-up applications, including Ford, Lincoln, Mercury, Edsel, Jeep, American Motors, International, Packard, and Studebaker vehicles. It is also commonly used in marine outboards, such as Evinrude and Johnson, as well as various tractors, including Ford 2000, 3000, and 4000 series.
This unit replaces OEM part number B6AZ-11450-A and is cross-referenced with SS581T, SS-581, ALL7620, C6AF, C7AF, C9AF, D2AF11450AA, 50-430, and SW3.
This is a 4-terminal solenoid. It features 5/16-24 studs for the battery and motor terminals, and 10-32 posts for the switch and relay terminals.
A failing solenoid often presents as a clicking sound when you turn the key, but the engine fails to crank. Other signs include intermittent starting issues, the starter motor remaining engaged after the engine has started, or a complete lack of response when attempting to start the vehicle.
Yes, this is a heavy-duty unit designed to handle the demands of high-torque racing starters and custom hot rod builds, providing reliable engagement for modified electrical systems.
Before installation, ensure your battery is fully charged and all cable connections are clean and free of corrosion. A poor ground or loose battery cable can mimic a bad solenoid, so verify the integrity of your wiring harness and starter motor connections to ensure the new part functions correctly.