The gel switch is the single
switch that you slide back and forth for the type of battery
you have. There are indicator lights to show which setting it is on, you can see these lights through the cover over the switches. There is also a bank of DIP switches that you to set the length of time for the 2nd stage charging
. This varies from 1 to 4 hours IIRC and it depends on the size of your bank. This information is in the manual for the charger
, if you don't have one you can download it from Promariner's website.
What camaraderie said is correct. This charger
can only be set for gel OR AGM/flooded, not both at the same time, so you need to standardize on one type of battery
or split your charging
system to handle the gel battery.