the solonoid just kills off the alternator...you could run some other things thru it like ignition feed but thats always better off the switch direct to the battery...

theres never a hot lead to the starter...battery to one side of switch...other side to starter..remember we are using the solonoid to break the power coming from the alternator..

when the switch is off..its all dead from the battery..

as far as wire size...the 2 yellows I parralleld from the solonoid because I ran out of the larger gauge that I used from the alternator...I want to say thats a #6 wire to the alternator...#2's to the starter and from the battery...

you can buy wire kits for remote batteries..maybe my background of being an electrician sorta helps..I know it looks like a mess but if you saw it or being there helps...pics somehow dont always show the exact detail...