There are two pairs of connectors you can use to power accessories pulling less than 10Amp (GPS, Heated grips…) either switched by ignition or permanent. Those are documented in the manual.
Two are under the seat, and an easy reach.
Two are inside the headlight housing and are more complicated to access:
- The manual points to the access hatch under the headlight housing where those should be accessible. On the R accessing the hatch requires removing the mud guard. But unfortunately, on most bikes the wires are tucked in in a way that make this access impractical.
- Another way to access is to dismantle the headlight, this takes a lot of screws, a lot of swearing, and solving the enigma of how to remove the metal bar. When you’ve done it once it become easier, and there are great how-to to get you there. The beginning of this video is a step by step removal of the complete front headlight; for the purpose of accessing the power plug there is too much dismantling, but it covers all the bases.
- Another alternative reported to work is to access the wires by disconnecting the headlight from the frame, 6 screws, pull it. Putting everything back in is the larger challenge, having another set of hand to help is not superfluous.
In all cases use loctite on all screws on reassembly.