This is for the "Texas Slim" which will support 2003-2009 Toyota 4Runners, 2007-2014 Toyota FJ Cruisers, & 2003-2009 Lexus GX470's. 

If you need 2010-2019 4Runners or GX460's, please go to our other listing for the OG in "A" mode.

VoltageBoosterPRO is a user adjustable diode modification with an inline fuse that allows you to safely increase your alternator voltage to optimize your AGM battery charging. AGM batteries (Optima, Odyssey, Northstar) are undercharged when used with your factory Denso alternator. Traditional flooded acid batteries at charged at ~13.8v, but AGM batteries often specify a charging voltage of 14.5+. Undercharging your AGM battery reduces battery lifespan and available charge capacity. The VoltageBoosterPRO lets you do a diode modification so that you can increase your alternator voltage output to charge your AGM battery a higher voltage while also maintaining a fuse for that circuit! This is perfect for your deep cycle AGM applications. 

We HIGHLY recommend not doing the DIY GM Diode mod, which when done REMOVES the safety fuse of that circuit. The GM Diode is NOT a fuse. Shorting a fuse using a plain diode is not a great idea. A team of engineers spent years designing the electrical system of your truck. If you do any diode mod, please make sure you have a fuse in that circuit! Otherwise if you have a short circuit, you may have a full battery amperage fire in your engine bay!

With this mod, you retain the fuse on that circuit, in a clean, easily removable package.

The “Low” mode provides ~0.4-0.5V of increased alternator voltage. The “High” mode is ~0.8-1.0V.

Each unit is made in San Antonio, Texas, USA. 

Visit our homepage www.VoltageBoosterPRO.com for more information.