Holley EFI Ford Foxbody Main Harness
Type: 5.0L Ford Main Harness | Fits: Ford
This harness is for fuel injected small block ford engines such as 5.0L or 5.8L Windsor powerplants. Plug and play ignition capability with Dual Sync and HyperSpark Distributors. The 5.0L Ford main harness is pre-terminated with Ford PWM IAC connector for the OEM PWM - idle air control motor commonly found on late 80's and early 90's engines. Compatible with Holley EFI Dominator, HP, and Terminator X and X Max ECU's.
Features:
- Designed for use with fuel injected small block ford engines
- Plug and play ignition capability with Dual Sync and HyperSpark distributors
- Compatible with Holley EFI Dominator, HP, and Terminator X and X Max ECU’s
- Comes pre-terminated with Ford PWM IAC connector for OEM PWM - idle air control motors
- For OEM Ford fuel injectors, use injector harness 558-209
- For TFI distributor applications, use ignition adapter 558-305
Specs:
- Brand: Holley EFI
- Category: Engine
- Emission Code: 4
- Grade Type: Performance
- Harness Application: Ford
- Harness Type: Main
- Part Type: Engine Wiring Harness
- Product Type: 5.0L Ford Main Harness
- Sub Category: Wire, Cable and Related Components
- Terminal Type: Pin
Tech Resources:
The following guide overviews all connections on the main harness. The main harness supports all the primary engine sensors, fuel and ignition for eight cylinder engines, the #1 wideband oxygen sensor, and the first four programmable input and output channels. There are two connectors for this harness designated as “J1A” (pin designations below that start with an A) and “J1B” (pin designations below that start with a B).
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Important Notices
- Off‑Road Use Only
Products sold by JS Speed are intended for off‑road use and may be illegal on public roads where emissions or pollution‑control laws apply. - Check Local Laws
Before purchasing or installing, verify all applicable local, state/provincial, and federal regulations to ensure the modification is legal in your area. - Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
