GM 4pin Alternator Harness

Wire your alternator cleanly with the GM 4-Pin Alternator Pigtail Plug Harness. This plug is used to wire high-output alternators or replace a damaged factory plug. Features S-F-L pin configuration for proper alternator communication and charging.

GM 4-Pin Harness Features

• GM 4-Pin Configuration (S-F-L) — Standard pinout for GM-style alternators
• Pigtail Design — Pre-wired leads for easy splicing or connector installation
• Multi-Use — Wire a new alternator or replace a damaged factory plug

Notes

• Compatible with GM-style alternators used in many JS Alternators high-output applications

Pro Tip: If your factory alternator plug is corroded, melted, or damaged, replacing it with a fresh pigtail ensures a solid electrical connection. A poor connection at the alternator plug can cause voltage drop, inconsistent charging, and even alternator failure.