Gen III Hemi Main Harness, Early, w/ TPS and Idle Air Control Connections
Type: Hemi Main Engine Harness
Gen III HEMI Harness with TPS and Idle Air Control Connections.
This wiring harness interfaces a Holley EFI ECU to a Gen III HEMI engine with an aftermarket cable actuated throttle body. It is meant to be used in conjunction with an injector harness, a coil harness, and two ignition modules. Most stock sensors are used with this harness. There are two optional connectors for interfacing with CAN-based Holley modules.
Features:
- Gen III Hemi Main Harness with IAC motor wiring/connector and TPS wiring/connector for a manual throttle body application
- Take control of your Gen III HEMI with Holley EFI by controlling fuel and spark. Great for power upgrades and engine swaps.
- Capable of tuning with power adders such as nitrous, superchargers or turbos and compatible with methanol and water injection
- Harnesses are available to connect to a Gen III HEMI engine for the most advanced fuel and timing controls available
- Each Harness is designed in fit and function specifically for the Gen III HEMI engine platform
- All wiring is TXL grade copper wiring with minimal weight, high temp sleeve in a small diameter
- Factory style terminations provide a strong, secure connection
- Connectors are OEM grade for a correct, positive fit
- Each harness is routed through a split-loom braid for protection and great looks
Specs:
- Brand: Holley EFI
- Category: Air and Fuel Delivery
- Emission Code: 4
- Harness Application: HEMI
- Harness Type: Main
- Ignition Type: GEN III HEMI
- Injector Connector: Not Included
- Part Type: Fuel Injection Harness
- Product Type: Hemi Main Engine Harness
- Sub Category: Wire, Cable and Related Components
Tech Resources:
NOTE: The TPS and IAC connectors are designed for Holley 4 BBL style throttle bodies. If you are using a different throttle body, you may have to change the pins and connectors.
Instructions - techlibrary_199r10555rev16.pdf
Instructions - 199r10909rev.pdf
Instructions - 558-115_gen_iii_hemi_main_harness_diagram.pdf
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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.
