So basically you just replace the 7.5 amp fuse in the ALT-S slot with LittleFuse part Number 02400113XP. You have to shave off a little plastic "ear" on the new part so it is the same shape as a regular mini-fuse so it fits the slot. It tricks the alternator into thinking the load is heavier than it really is giving you approximately a .5 volt increase in charging. This is needed when going from a regular lead-acid battery to an AGM-type battery so it will charge correctly. Make sure you install it in the correct direction or you will have no charge to your battery. That's bad...