Switched power on bike, radio install

Ok, -- on a motorcycle (unlike a car), the black negative wire goes directly back to the battery, right? -- the yellow power cable, fused close to battery, also connects directly to the battery -- the red power wire goes to somewhere switched... MY QUESTION - Where is the best place to pull switched power from on a bike? And do I need to incorporate a relay? Thank you, // Radar //RadarContact

You can ground to the frame. Switched wire can be found at ignition switch, or at the fusebox.

Thank you RadarContact