Aact 425 May 2026

This article dives deep into everything you need to know about AACT 425—what it is, where it’s used, common failure symptoms, installation best practices, and why it’s a cornerstone of modern diesel electrical architecture. To the uninitiated, AACT 425 might look like a random alphanumeric code. However, for technicians, parts managers, and fleet maintenance professionals, this number represents a high-reliability, heavy-duty solenoid or relay assembly. Depending on the manufacturer (with common cross-references to brands like Cole Hersee, Trombetta, and Stribel), AACT 425 is typically designated as a continuous-duty solenoid switch .

Set your DMM to Ohms (Ω). Measure resistance between the two small terminals (the coil). A healthy AACT 425 should read between 10 and 30 ohms. An open circuit (OL) indicates a burnt coil. A short (0 ohms) means the coil is fried.

With no power applied, measure resistance between the two large terminals. You should see infinite resistance (OL) – the switch is open.

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  • U2 – I will Follow – Where The Streets Have No Name
  • Kings of Leon – Sex on Fire
  • Jackyl – The Lumberjack (met Kettingzaag!!!)
  • Foo Fighters – The Pretender
  • Blur – Song 2
  • Greenday – Basket Case
  • Johnny Cash – Ring of Fire
  • Nirvana – Smells Like Teen Spirit
  • Elvis – Heartbreak Hotel – That’s Allright Mama, Mystery Train – One Night
  • Iron Maiden – Wasted Years – Can I Play With Madness
  • The Hives – Hate to Say I told you So
  • Stray Cats – Runaway Boys – Rock This Town – Stray Cats Strut
  • Cheap Trick – I want You to want Me
  • The Baseballs – The Look – Black or White
  • Dick Brave – American Idiot
  • Muse – Plug In Baby
  • Jimi Hendrix – Purple Haze
  • Janis Joplin – Take a Little Piece
  • The Beatles – Hard Days Night  – I wanna Hold your Hand
  • The Kinks – All Day and All of the Night
  • Volbeat – Sad Man’s Tongue
  • Mumfords and Sons – Little Lion Man
  • Pearl Jam – Alive – Porch – Black
  • Me First and the Gimme Gimmes – Over the Rainbow – Ain’t No Sunshine when shes’s Gone
  • AC/DC – Highway to Hell – Whole Lotta Rosie – Thunderstruck
  • Jerry Lee Lewis – Great Balls of Fire
  • James Brown – I Feel Good
  • CCR – Bad Moon Rising
  • Queen – Crazy Little Thing Called Love
  • Adele – Rolling in the Deep
  • Led Zeppelin – Stairway to Heaven
  • Radiohead – Creep
  • John Denver – Leaving on a Jet Plain

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    This article dives deep into everything you need to know about AACT 425—what it is, where it’s used, common failure symptoms, installation best practices, and why it’s a cornerstone of modern diesel electrical architecture. To the uninitiated, AACT 425 might look like a random alphanumeric code. However, for technicians, parts managers, and fleet maintenance professionals, this number represents a high-reliability, heavy-duty solenoid or relay assembly. Depending on the manufacturer (with common cross-references to brands like Cole Hersee, Trombetta, and Stribel), AACT 425 is typically designated as a continuous-duty solenoid switch .

    Set your DMM to Ohms (Ω). Measure resistance between the two small terminals (the coil). A healthy AACT 425 should read between 10 and 30 ohms. An open circuit (OL) indicates a burnt coil. A short (0 ohms) means the coil is fried.

    With no power applied, measure resistance between the two large terminals. You should see infinite resistance (OL) – the switch is open.