I'm guessing you have the WFCO 9500LIS converter/power center ???? I was not aware that Keystone had started using the "FLA/LI converter systems.
If you do, you can download the owner's manual for the power center here:
https://wfcoelectronics.com/wp-conte...-Manual-RP.pdf
This is a drawing of the 12 volt fuse panel that sits inside the power center door along with the 120VAC circuit breakers.... Note that along the bottom is the reverse polarity fuses and the lug connectors for the battery cables. To the left of the reverse polarity fuses is a small switch. Down is FLA battery and UP is LI battery selection. When the switch is in the LI position, there is an LED above the switch that will illuminate.
DON'T USE THE LI POSITION WITH A FLA BATTERY, THE VOLTAGE WILL OVERCHARGE THE BATTERY AND COULD CAUSE A FIRE.