The VoltageBoosterPRO Texas Slim Edition is for the Toyota 4th gen 4Runner (2003-2009), Toyota FJ Cruiser (2007-2014), and the Lexus GX470 (2003-2009).
It’s slimmer, taller, and with longer legs than the OG model.
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 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!
We HIGHLY recommend not doing the DIY GM Diode mod, which when done REMOVES the safety fuse of that circuit. The drop in GM Diode is NOT a fuse. Shorting a fuse using a plain diode is a bad 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 will 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.
- 2003-2009 Toyota 4Runner
- 2007-2014 Toyota FJ Cruiser
- 2003-2009 Lexus GX470
One Minute Installation
- Locate the ALT-S fuse in the engine fuse box.
- Remove it and place into the Voltage Booster PRO
- Place the Voltage Booster PRO into the removed fuse location