How i did mine. Got idea from another guy on cog, but figured id share it here. if you're handy with a soldering iron, this is a no brainer. can swap out a potentially bad relay side of road if need be (but these are rated high so will probably outlast bike) the typical aftermarket 5-wire 30a automotive relay used for driving lights and elec fans.
diagrams are here that i used.
http://web.ncf.ca/ag136/jBoxDiagnosis.htmsplit box, take relays off old board. note where they went.
holes drilled and grommeted, wires pulled. 4 wires per relay. (+, -, switched 1 and switched 2)
small mount plate on inner fender under seat on LH side of bike. sealed bolt holes and tapped plate to m6. used shallow bolts to mount relays.