Merchant Automotive High Idle Kit - 2001-2004 GM Duramax 6.6L LB7

Product Name: Merchant Automotive High Idle Kit - 2001-2004 GM Duramax 6.6L LB7
Manufacturer: Merchant Automotive
Manufacturer Part #: 10457
Thoroughbred Diesel Part #: MAT10457
Fitment Notes: 2001-2004 GM Duramax 6.6L LB7

The Merchant Automotive High Idle Kit for 2001-2004 GM Duramax 6.6L LB7 is designed to improve engine performance during idle, offering faster warm-ups, enhanced charging output, and reduced engine wear in situations where extended idling is required. This kit is especially useful for drivers who often idle their vehicle in cold weather or need higher electrical output while idling.

This high idle kit is perfect for Duramax owners who frequently use their vehicle in cold climates or need higher electrical output during idle periods. It's a great addition for increasing overall efficiency and reducing wear on your engine.

Note: 

• Will not work with the medium duty trucks as there is a built in High Idle already

Full manual control of the elevated idle on your Duramax truck is possible with our High Idle Kit.

Operation is simple using only your cruise switch, no extra switches to mount or hide in your truck and features fool proof operation.

Get faster warm ups, increased output from your charging system and reduced wear on your engine during situations that require idling for extended periods of time.

Kit Includes

• Wire with ECM pin
• Wire loom
• Scotch lock
• Grommet
• Zip ties
• Instructions

Merchant Automotive High Idle Kit Features:

• Faster Warm-Ups: Increases engine RPM during idle, which speeds up engine warm-up times, making it particularly useful in cold weather.
• Increased Charging Output: With a higher idle RPM, the alternator generates more power, providing increased electrical output for accessories such as heating, lighting, and other electronic systems.
• Reduced Engine Wear: By elevating the idle speed, the kit helps minimize engine wear during long periods of idling, which can occur in cold weather or during stationary use.
• Improved Efficiency: Ideal for work trucks, emergency vehicles, or any situation where idling is necessary for extended periods.
• Plug-and-Play Installation: Designed for easy installation with no need for major modifications, making it a simple upgrade for your 2001-2004 GM Duramax 6.6L LB7 engine.
• User Control: Allows you to manually activate the high idle feature when needed, giving you control over when and how to use it.
• OEM Compatibility: Fully compatible with the LB7 Duramax engine and factory systems, ensuring seamless integration and reliable operation.
• For more information on Merchant Automotive call us at 1-859-737-4966

FAQ

Will this affect the factory cruise control function?

All of the functions will work as they did before while driving. In this case, the cruise buttons are only used to control the function of the high idle while in Park or Neutral.

I just installed this and it is not working, what now?

The most common issue is the connection of the high idle wire to the brake switch. It may help to strip the insulation on the high idle wire and a portion of the insulation on the green/white wire at the brake switch. Then the wire can be twisted together and taped up or even better, a drop of solder then covered with tape.

If you are sure you have a good clean connection, then we need to check the green/white wire for power. We should see 12 volts when in Park or Neutral and the brake pedal is released. 

If you do not have power on that circuit, check the 10amp BTSI fuse in the under-hood fuse block. 

If you find the fuse to be in good shape, use a test light or meter to ensure you have power at both sides of the fuse. 

If you have no power to the fuse, then check the reverse lights. With the key on and engine off, put the gear selector in reverse and see if the lights are on. If not, lets take a close look at the 20amp B/U LP fuse in the under-hood fuse block and replace if needed.

Will this work if I have a ZF6 manual transmission?

Yes. The install will be exactly the same for the ECM pin installation. We are using the Shift Interlock feature to supply power to activate the high idle. The shift interlock is the safety feature that requires you to step on the brake to remove the gear shift from Park. The manual transmission does not have this feature of course. It is recommended to install a switch from an ignition hot circuit to the end of the wire that would normally attach to the brake switch. The switch must be turned on to activate the high idle with the cruise buttons. It is very important that the switch is shut off while driving or the RPM will be limited. You could also use the switch as a valet mode if you wish. The limited RPM will not hurt anything, but will very frustrating to drive the truck.