If you’re upgrading your 3rd gen 4Runner to a CS144 high-output alternator, this is the harness that makes the swap clean, simple, and reliable.

The factory alternator wiring on the 1996–2002 4Runner uses a Toyota 3-pin connector (IG–S–L). Most CS144 alternators use a GM-style regulator plug, which means cutting, splicing, or building your own wiring. This plug-and-play CS144 adapter harness eliminates the guesswork and lets you connect your new high-output alternator the right way.

Whether you’re running a winch, dual batteries, off-road lighting, onboard air, or a full overland setup, a CS144 swap is one of the best electrical upgrades you can make to a 3rd gen. This harness keeps the install clean and factory-looking — no hacked wiring under the hood.

In house harness by TEQ Offroad for Toyota owners who actually use their trucks. Retro yellow-orange-red wiring as a hat tip to the Toyota heritage! 

Features

• Plug-and-play CS144 alternator adapter harness

• Converts Toyota 3-pin (IG–S–L) to GM CS144 regulator connector

• No cutting or splicing required

• Clean, factory-style installation

• Designed for reliability in off-road and high-vibration environments

• Perfect for high-output alternator upgrades (140–200+ amps)

Vehicle Fitment

• 1996–2002 Toyota 4Runner (3rd Gen)

• 5VZ-FE 3.4L V6

• 3RZ-FE 2.7L 4-cylinder

• Requires factory 3-pin Denso alternator connector

• Also Fits 1st gen Tacoma and 80 Series Land Cruisers!

Note: This harness handles the wiring portion of the CS144 swap. Mounting brackets and pulley alignment modifications may vary depending on your engine and alternator configuration.

Why Upgrade to a CS144?

The stock 3rd gen alternator is only 70–80 amps. Once you add modern accessories, it struggles to keep up — especially at idle.

A CS144 provides:

• Higher output at idle

• Support for winches and dual battery systems

• Stable voltage for lights, compressors, and overland gear

• Proven reliability in demanding off-road builds

Built for Toyota Owners Who Love Offroading

At TEQ Offroad, we design parts the way we’d want them on our own rigs — simple, durable, and made to work the first time. No shortcuts. No unnecessary complexity. Just a clean solution for a common 3rd gen 4runner upgrade.