Will this effect the factory cruise control function?
No. 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 underhood 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 lets 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 underhood 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.
Great inexpensive addition, February 8, 2019 By Anonymous (Racine, WI)(Verified)
Wish I would’ve gotten this product sooner. Helps a lot with engine warm-up time and works perfectly. Install was a breeze thanks to the detailed instructions and video.
Great investment, January 15, 2019 By Jordon (Mead, CO)(Verified)
Kit comes with everything needed to install as well as a great install guide. Truck warms up a lot quicker and also keeps oil pressure up. Definitely recommend this product.
Great kit, December 14, 2018 By Trevor (COLORADO SPRINGS, CO)(Verified)
This kit was super easy to install with easily understandable instructions and everything I needed for a successful high idle kit install. Thank you Merchant Auto
Lb7 high idle, November 25, 2018 By Anonymous (Harrington, DE)(Verified)
Awesome! Works great
Works great, October 29, 2018 By Anonymous (EVANSVILLE, IL)(Verified)
Instructions were mostly clear for a guy that isnt an experienced mechanic. Product works great!
Great product, October 4, 2018 By Anonymous (Sanford)(Verified)
Shipping was good. Simple install, just follow along with the YouTube video and youâ€™re golden! Works great on my 2003 duramax. Simple and effective. Great product
Definitely worth the price of admission!!, May 2, 2018 By Aaron (Buckley, WA)(Verified)
Super simple, inexpensive, works great..... what's not to like?! And on my '01, I get all 3 levels of high idle!!
High idle kit, February 1, 2018 By Mike (Indianapolis, IN)(Verified)
Came on time and did exactly as advertised. Instructions are spot on. Less than an hour of work and a 12 minute head start, you'll have a warm truck. Couldnt be happier with nu purchase
High idle kit, December 23, 2017 By Anonymous (FOLSOM, CA)(Verified)
This kit was right on! Itâ€™s a little funny to pay $20 for a wife and some zip ties but it is well worth it! The instructions are worth the $20 alone and the fact that I donâ€™t have an additional switch or extra holes in my dash is awesome. The hardest part was getting the grey retainer off of my ECM (and back on- apparently it only goes on one way). Well done Merchant Auto!
Nice Kit/ Worth The Money, November 22, 2017 By Anonymous (Whitewood, SD)(Verified)
Install was not great but not bad. Took a little more time in my case because the ECM had been worked on before I had it. I didn't have the room to just pull the connector out in the open like in the video in my case. Just make sure you have a good connection with the blue connector! Over all in my case it was still well worth it in the end. I would buy it again!
High idle kit, October 28, 2017 By Anonymous (WATERTOWN, SD)(Verified)
Great product, great install video
High idel kit, September 28, 2017 By Mark (Orting, WA)(Verified)
Nice, simple, as advertised. So why didn't GM do it to begin with? Right?