Mechman H113-L-1 Toyota/Lexus 4-Pin AGM Voltage Boost Harness +0.4V to +0.6V

• INCREASES CHARGING VOLTAGE: Raises alternator output by approximately 0.4 to 0.6 volts to support compatible AGM batteries requiring a higher charging range.
• TOYOTA/LEXUS 4-PIN DESIGN: Built for select Toyota, Lexus, and Scion vehicles equipped with a compatible 4-pin alternator regulator connector.
• PLUG-AND-PLAY INSTALLATION: Connects between the factory vehicle harness and alternator without cutting, splicing, or permanently modifying the original wiring.
• WEATHER-SEALED CONSTRUCTION: High-quality connectors are sealed and epoxied to help resist moisture, corrosion, daily driving, and off-road conditions.
• SUPPORTS HIGH-DEMAND SYSTEMS: Ideal for compatible vehicles running upgraded AGM batteries, high-output alternators, car audio systems, auxiliary lighting, or additional electrical accessories.

Mechman H113-L-1 Toyota/Lexus 4-Pin AGM Voltage Boost Harness +0.4V to +0.6V

This Listing Includes

• (1) Mechman harness 4-pin regulators H113-L-1

Give your AGM battery the charging voltage it needs with the Mechman H113-L-1 Voltage Boost Harness. Designed for compatible Toyota, Lexus, and Scion vehicles equipped with a 4-pin alternator regulator connector, this plug-and-play harness increases alternator charging voltage by approximately 0.4 to 0.6 volts.

Many factory charging systems operate below the preferred charging range of certain AGM batteries. The H113-L-1 installs between the vehicle’s factory wiring harness and the alternator regulator connection, helping raise system voltage without cutting, splicing, or permanently modifying the factory wiring.

Built with high-quality Toyota/Lexus-style connectors, the harness is weather-sealed and epoxied to help protect it against moisture, corrosion, and demanding daily-driving or off-road conditions. It can be used with a compatible factory alternator or Mechman high-output alternator.

Features

• Raises charging voltage approximately 0.4V to 0.6V


• Designed for AGM batteries requiring higher charging voltage


• Compatible with select Toyota, Lexus, and Scion applications


• Fits compatible 4-pin alternator regulators


• Plug-and-play installation


• No cutting, splicing, or permanent wiring modifications


• Connects between the factory vehicle harness and alternator


• Works with compatible OEM and Mechman alternators


• Weather-sealed and epoxied connectors


• Helps protect against moisture and corrosion


• Useful for high-output audio, lighting, off-road, overlanding, and accessory-heavy vehicles


• Removable design allows the vehicle to be returned to its original configuration

Specifications:

• Brand: Mechman


• Model: H113-L-1


• Product Type: Alternator Voltage Boost Harness


• Connector Type: Toyota/Lexus-Style 4-Pin Regulator


• Voltage Increase: Approximately 0.4V to 0.6V


• Installation Type: Plug-and-Play


• Recommended Battery Type: AGM


• Wiring Modification Required: No


• Compatible Alternators: Select OEM and Mechman alternators


• Quantity: 1 Harness


• Weight: Approximately 1 lb

Installation:

1. Disconnect the vehicle’s negative battery terminal.


2. Locate the 4-pin regulator connector at the alternator.


3. Unplug the factory wiring connector from the alternator.


4. Connect the H113-L-1 harness to the vehicle-side connector.


5. Connect the opposite end to the alternator.


6. Reconnect the battery and verify charging voltage with a digital multimeter.

Important Fitment Information:

This harness fits select Toyota, Lexus, and Scion vehicles with a compatible 4-pin alternator regulator connector. Vehicle year, engine size, and model alone do not guarantee compatibility.

Compatible applications may include select versions of:

• Toyota Corolla


• Toyota Camry


• Toyota Matrix


• Toyota RAV4


• Toyota Avalon


• Toyota Highlander


• Toyota Sienna


• Toyota Tacoma


• Toyota Tundra


• Toyota Sequoia


• Toyota 4Runner


• Toyota Venza


• Scion xD


• Scion xB


• Scion tC


• Lexus RX330


• Lexus RX350


• Lexus ES350


• Lexus IS250


• Lexus RC350


• Lexus GX460

Verify that the vehicle uses the matching 4-pin regulator connector before ordering. Some listed models and years may use a different regulator connection.

(These are just popular fitments; please ensure your current alternator has the 4-pin style alternator plug and NOT the oval 3-pin. If you do not see your vehicle listed and cannot confirm fitment, please email us BEFORE ordering!)

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