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Holley EFI 558-475 GM PWM Alternator Harness for 2007+ Late Model Applications

Manufacturer

Picture for manufacturer Holley EFI

Part Number

558-475
8 reviews
Sale Price

$92.75

In Stock (10+)

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Usually delivered within 2 days

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Live-in-stock inventory

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Fitment guaranteed

Fitment guaranteed

Product Details

The Holley EFI 558-475 GM PWM Alternator Harness is designed specifically for 2007 and newer GM pulse-width modulated (PWM) alternators, providing seamless integration with late model OEM charging systems. This harness eliminates the need for custom wiring when upgrading to a modern alternator with your Holley EFI or Terminator X system.

Key Features:

  • Engineered for 2007+ GM PWM alternators with OEM-style connectors
  • Plug-and-play compatibility with Holley EFI and Terminator X main harnesses
  • Allows use of late model GM factory alternators for reliable charging performance
  • Includes detailed installation instructions and software configuration guide
  • Eliminates custom wiring and guesswork during alternator installation

This harness is ideal for engine swaps, retrofits, or performance builds where a modern GM alternator is being used with a Holley EFI engine management system. The PWM alternator communication ensures proper charging control and system voltage regulation through your ECU.

Products specifications

Brand

Holley EFI

Category

Electrical, Charging and Starting

Connector Color

Black

Emission Code

5

Grade Type

Performance

Part Type

Alternator Harness

Product Type

Harness

Sub Category

Alternator / Generator and Related Components

Warning

California Proposition 65

Fast and easy

Quick and easy to use

Fast service!

good but need to exchange ladder

Easy to use website, good prices.

Exact product fast ship

Good

I mistakingly ordered two of the product. someone from customer service contacted me to verify it I actually wanted two. So we cancelled the extra order. Most companies would not go that step in customer service, much appreciated. The product arrived really fast and was exactly what I ordered and worked perfectly.

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