Hi D4NPH,
Right, this how I wired mine (and they get VERY hot!!) ......
There is a 10 amp fuse under the seat on the left marked "ignition". You need to remove the 2 6mm hex-headed screws holding the fuse box, lift it up and tap into the orange wire underneath (see pic 1). This is an unregulated supply which feeds from the ignition switch.
My memory was not serving me well as I didn't use a separate relay at all, but simply tapped into the wire with a Scotchlock insulation dispacement connector (I'm fairly sure that fuse is fed via a relay anyway). I don't like Scotchlocks but it's what came with the Oxford grips and as it is well away from any water it shouldn't become a problem. Also there is not much room under the fuse box and cutting into that wire and remaking a joint would be awkward.
The first pic shows the fuse box raised up and the scotchlock in place on the orange wire. The other scotchlock on the right of the pic is a permanent live feed I connected the battery conditioner plug into.
The second pic is the fuse box back in place and the 5 amp fuse and holder tucked into the gap next to the fuse box. The twin core black cable came as part of the kit and is tyrapped under the tank and runs up to the headlamp cowl where the controller and grip connectors live.
The ground connection is the frame bolt to the right and slightly forward of the fuse box. As I say, these grips get very hot and warm up in about 1 -2 minutes.
I hope that helps.
