Fleece Performance 04.5-07 GM Duramax 6.6L LLY / LBZ GM All Lights On

Run Every Light on Your LLY or LBZ Duramax Without Relay Splicing or Custom Wiring

The Fleece Performance FPE-GM-ALO-37 All Lights On module plugs directly into the factory fuse box on 2004.5-2007 GM Duramax LLY and LBZ trucks, activating the high beams, low beams, and fog lights simultaneously whenever high beams are switched on. The FPE-GM-ALO-37 requires no relay installation, no wire cutting, and no custom harness fabrication. One plug-in connection is all that is needed to gain full simultaneous lighting output from the factory lamp circuit on your LLY or LBZ equipped Silverado or Sierra.

Key Features

• Plug-in fuse box installation for 2004.5-2007 GM Duramax 6.6L LLY and LBZ trucks
• Activates high beams, low beams, and fog lights simultaneously when high beams are on
• No wire cutting, no relay wiring, no custom harness required
• Direct plug-and-play connection at the factory fuse box
• Improves forward lighting output without adding aftermarket light bars or aux lighting
• Designed specifically for the LLY (2004.5-2005) and LBZ (2006-2007) fuse box connector configuration
• Compact module installs in minutes and is fully reversible
• Made by Fleece Performance Engineering, a specialist in GM diesel fuel and electrical systems

Fitment

Specifications

What's Included

• 1 FPE-GM-ALO-37 All Lights On plug-in module
• Installation instructions

About Fleece Performance Engineering

Fleece Performance Engineering develops diesel-focused electrical, fuel, and drivetrain components for Cummins, Duramax, and Powerstroke platforms. From the Cheetah lift pump to plug-in modules like the FPE-GM-ALO-37, Fleece builds products that solve real diesel performance and reliability problems without requiring fabrication skills from the installer. All Fleece products are engineered and assembled in the USA.

Frequently Asked Questions

The FPE-GM-ALO-37 simultaneously activates the high beams, low beams, and fog lights on 2004.5-2007 GM Duramax LLY and LBZ trucks whenever the driver switches on the high beams. From the factory, the low beams and fog lights turn off when high beams are activated. The FPE-GM-ALO-37 bypasses this restriction without any permanent wiring changes.

No. The FPE-GM-ALO-37 installs entirely through a plug-in connection at the factory fuse box. No wires are cut, no relays are added, and no harness fabrication is required.

The FPE-GM-ALO-37 is designed for 2004.5 and later LLY and LBZ Duramax trucks. The 2004.5 model year marks the transition to the LLY engine configuration. Early 2004 models used the LB7 Duramax and have a different fuse box configuration that this module does not cover.

Yes. The FPE-GM-ALO-37 is specifically designed for both the LLY Duramax (2004.5-2005) and the LBZ Duramax (2006-2007), which share the same fuse box connector interface that this module plugs into.

Yes. The FPE-GM-ALO-37 works on both the Chevrolet Silverado 2500HD and 3500, and the GMC Sierra 2500HD and 3500, equipped with the 6.6L Duramax LLY or LBZ engine in the 2004.5-2007 model years.

Yes. Because the FPE-GM-ALO-37 is a plug-in module with no wire modifications, it can be unplugged and removed at any time with no lasting effect on the vehicle's electrical system.

Running additional lamps simultaneously increases heat output and electrical load on the stock bulb sockets. Bulb life may be reduced compared to standard use. The circuit is within factory design tolerances, but users who frequently drive on high beams may go through bulbs at a slightly higher rate.

As with any aftermarket add-on module, check with your dealership regarding warranty implications. Because the FPE-GM-ALO-37 is fully reversible and makes no permanent modifications, it presents minimal risk in that regard. Consult your dealer if your truck is still under a powertrain warranty.

Installation Instructions

1. Confirm your truck is a 2004.5-2007 Chevrolet Silverado or GMC Sierra equipped with the 6.6L Duramax LLY or LBZ engine.
2. Locate the factory fuse box in the cab (typically under the dash or on the driver-side kick panel).
3. Identify the connector specified in the included FPE-GM-ALO-37 instruction sheet.
4. Plug the FPE-GM-ALO-37 module into the designated fuse box connector.
5. Test by turning on the headlights, then switching to high beams and verifying all three lamp circuits activate together.

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.