yes it is safer to add the piggy back to the fuse box
one fuse will keep the fuse live
the other fuse will make the AC wire live
so just join the wires up and just keep the extra fuse in place
dont try this any other way
one fuse will keep the fuse live
the other fuse will make the AC wire live
so just join the wires up and just keep the extra fuse in place
dont try this any other way