I see that there is a post (Max BR1 LTE Version Terminal Block Hookup) where they discuss putting the positive in positive…but, all I see is a screw on each end of the block…which does not look like you can put a wire into and four channels with set screws with - O/P I/P - under them…which is (vaguely) explained here (MAX-BR1-LTE-E-T Terminal Block specifications (for installation in car) - #8 by amaranth).