i have installed 3 of theses in the last year and i put them on the 1-both-2 switch...they all had #2 wire going from the switch to both batteries and so far there hasn't been any problems that i have found...i think as long as you hook it up to large cables you will not loose anything in the charging feater....
regards
woody
ps if i am doing this wrong...... i feel sure that some will help me correct it .....
regards
woody
ps if i am doing this wrong...... i feel sure that some will help me correct it .....