How long is shipping for Holley?

Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.

How do I install the Holley J4 Auxiliary Harness — Fits Holley Dominator EFI?

Most installs are bolt-on with basic hand tools. See manufacturer documentation for torque specs and procedures.

How long is shipping for Holley?

Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.

How do I install the Holley J4 Auxiliary Harness — Fits Holley Dominator EFI?

Most installs are bolt-on with basic hand tools. See manufacturer documentation for torque specs and procedures.

How long is shipping for Holley?

Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.

How do I install the Holley J4 Auxiliary Harness — Fits Holley Dominator EFI?

Most installs are bolt-on with basic hand tools. See manufacturer documentation for torque specs and procedures.

How long is shipping for Holley?

Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.

How do I install the Holley J4 Auxiliary Harness — Fits Holley Dominator EFI?

Most installs are bolt-on with basic hand tools. See manufacturer documentation for torque specs and procedures.

How long is shipping for Holley?

Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.

How do I install the Holley J4 Auxiliary Harness — Fits Holley Dominator EFI?

Most installs are bolt-on with basic hand tools. See manufacturer documentation for torque specs and procedures.

Holley

Holley J4 Auxiliary Harness — Fits Holley Dominator EFI

Name: Holley J4 Auxiliary Harness — Fits Holley Dominator EFI
Brand: Holley
SKU: BBVL_558-404
Price: 206.95 USD
Availability: InStock

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Holley

Holley J4 Auxiliary Harness — Fits Holley Dominator EFI

SKU: BBVL_558-404

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About Holley Holley is the legendary American carburetor and fuel-injection ...Read More

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Car Wheel Size Chart

Wheel Diameter (inches)	Tire Width (mm)	Aspect Ratio	Rim Width (inches)
14	185	65	5.5
15	195	60	6.0
16	205	55	6.5
17	215	50	7.0
18	225	45	7.5
19	235	40	8.0
20	245	35	8.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

225 = Tire width in mm
45 = Aspect ratio (height as % of width)
R17 = Rim diameter in inches

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About Holley

Holley is the legendary American carburetor and fuel-injection brand — over 100 years of induction history. From the iconic 4150 four-barrel to today's Sniper EFI conversions, Holley remains the choice for muscle car restorations, Pro Mod, and gasser builds.

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Holley J4 Auxiliary Harness for Dominator EFI

Unlock the full potential of your Holley Dominator EFI system with the J4 Auxiliary Harness. This high-quality harness is engineered to provide robust and reliable connections for auxiliary functions, essential for advanced engine management and tuning. Whether you're integrating sophisticated sensor arrays or custom control modules, the J4 harness ensures signal integrity and simplifies your wiring loom.

Product Highlights:

Designed exclusively for Holley Dominator EFI systems
Facilitates the connection of J4 auxiliary components
Constructed with premium materials for maximum durability
Streamlines complex wiring installations
Each unit is a complete harness for immediate use

The Holley J4 Auxiliary Harness is a critical component for any serious performance enthusiast or professional tuner. It allows for the seamless integration of additional sensors, switches, and control devices, providing the data and functionality needed for optimal engine performance and diagnostics. Ensure your Dominator EFI setup is complete and reliable. Discover top-tier automotive parts at GGCRACING.