Heavy-Duty Solenoid Power for Custom Door and Trunk Release Systems

Precision, reliability, and clean integration — that’s what separates a professional-grade electrical system from a backyard install. The SPAL SIL40K Door/Trunk Popper Solenoid Kit is engineered for builders who demand dependable 12V actuation in their custom door, trunk, or hatch release systems.

Built around SPAL’s proven SIL40K high-torque solenoid, this kit provides a compact, powerful solution for remote-activated release mechanisms. With 1.25 inches of linear travel, a robust plunger design, and a 40-amp relay included for safe circuit management, it delivers the muscle needed to pop heavy latches without hesitation.

Whether you’re wiring shaved door handles on a street rod, adding a remote trunk release to a race vehicle, or building a custom latch system from scratch, this SPAL kit provides the durability and simplicity to get the job done right.

Built for Performance and Reliability

SPAL is recognized worldwide for producing OEM-quality electrical components trusted in motorsport, aerospace, and high-end automotive manufacturing. The SIL40K solenoid is no exception — designed to provide smooth, reliable operation under demanding voltage and vibration conditions.

Its compact, sealed construction resists corrosion and moisture intrusion, making it ideal for both interior and exposed installations. The included 40A relay ensures safe, isolated switching, preventing circuit overload and extending solenoid life.

From door latch release systems to custom-engineered mechanical actuation setups, the SIL40K has become a go-to choice for fabricators and installers who need high output in a small, efficient package.

Technical Specifications

Key Features

• High-Torque Solenoid: 1.25" of strong, consistent travel for door or trunk release mechanisms.

• Integrated Mounting Bracket: Simplifies installation on frames, panels, or latch supports.

• 40A Relay Included: Ensures proper electrical isolation and prevents switch overloading.

• Compact Design: Fits in tight spaces behind panels or in trunk enclosures.

• Durable Zinc-Plated Housing: Corrosion-resistant finish for long service life.

• Universal Compatibility: Works with 12V automotive electrical systems.

• Proven SPAL Reliability: OEM-quality construction trusted in motorsport and performance builds.

Application Fitment

The SPAL SIL40K Solenoid Kit is a universal 12V actuation system compatible with nearly any vehicle type or custom application, including:

• Shaved-door handle conversions on hot rods and street customs

• Remote trunk or hatch release systems

• Race vehicle access panels or compartment actuators

• Custom fuel door, tailgate, or latching mechanisms

It can be triggered using standalone momentary switches, keyless entry systems, or ECU-based outputs for advanced setups.

Wiring Overview

This kit includes a 40A relay with labeled terminals for easy setup:

• Red (#30): Main 12V power source

• Black (#85): Ground or switched sensor input

• Blue (#86): Trigger wire from momentary or ignition circuit

• Yellow (#87): Output to solenoid positive terminal

• White (center): Not used

Use appropriate gauge wire for current draw and fuse protection. An inline fuse and switch can be added as desired for additional circuit safety.

Installation Notes

Mount the solenoid securely using the built-in bracket. Connect the button-end plunger to your latch or rod linkage using a clevis or cable loop, ensuring smooth, bind-free movement through its full 1.25" stroke.

For best results, use a momentary 12V switch or remote relay trigger to energize the solenoid only when required. Avoid continuous activation to prevent solenoid overheating.

⚙️ Recommended Setup:

• Wire the relay through your ignition-controlled 12V feed for safety.

• Use a 30A inline fuse for circuit protection.

• Verify latch travel requirements before final installation.

Trusted Electrical Engineering from SPAL

SPAL Automotive is known for its uncompromising approach to quality and electrical reliability. Every SIL-series solenoid undergoes bench testing and thermal cycling validation to ensure consistent operation across thousands of activation cycles.

With a legacy built in OEM and motorsport environments, SPAL components are the choice of professionals who can’t afford failure — and that’s exactly why Fenix Motorsports carries them.

The Fenix Motorsports Advantage

At Fenix Motorsports, we don’t sell parts we wouldn’t use ourselves. Our focus is on reliability, performance, and simplicity — especially when it comes to electrical components. The SPAL SIL40K kit offers the kind of quality that keeps your build dependable season after season.

• Real-world tested on street and race applications

• Expert guidance for wiring and integration

• Fast U.S. shipping and responsive technical support

• Trusted by builders and fabricators nationwide

Why Buy from Fenix Motorsports

When you buy from Fenix, you’re not buying another generic part — you’re investing in proven reliability. Our team curates only components that meet professional-grade standards for performance and longevity. Whether it’s powering your door popper system or a full custom electrical setup, this kit is designed to perform when you need it most.

Fenix Motorsports — Performance Driven Since 2021.