This voltage booster corrects your alternator output by approximately 1/2 to 3/4 of a volt. It will force the alternator to output between 14.1 and 14.7 volts to correctly charge and manintain AGM Batteries brands such as Odyssey, Optima, Nothstart, etc.)

Simply replace the ALT-S fuse in your front fusebox with this booster and retain your factory fuse protection.

Verified to work with:

2003-2009 4Runner

This will only work with MINI FUSE - it will not work with other makes/ models/ years not listed above!

1 YEAR WARRANTY ON PART - We will replace any failed part, no questions asked.