First off, I don't recommend the headlight mod to anyone.
Second off, I did the garage opener at the same time. I would've loved to kept them separate but you're going to have to deal with it.
I'm going to bounce around so try to pay attention.
First off, I'd bought an HID headlight kit. It was one that was recommended on this site. I want to say it was 50 bucks but it was plug and play.
I took my Christmas bonus and bought a garage door and opener from Lowes. It's nice, because my old door was manual.
I keep an opener in my jacket pocket but it's the pocket I use for toll money and it got weird. I'd also have to stop and fumble to open the pocket, reach in and feel the buttons out. It was a hassle for my fat sausage fingers.
Bought a backup, single button opener on ebay for 20 bucks, shipped.
I read the forums about the Pass light button and liked the idea, didn't care for switches on the chrome speedo bezel or neck. I also didn't like the idea of taking my hand off the bars to operate it.
I could've wired it in to the bike but then I would've needed a transistor to bring the voltage down since my opener used a single 2032 coin battery.
I chose to crack open the left instrument box dealy.
I took the headlight apart (two little Phillips screws at 4 and 8 o'clock)
I spent a long time measuring continuity and voltages and referencing wiring diagrams with different colors and years.
My bike is an '08. YMMV.
I disconnected the switch box harness and completely removed it from the bike. I got an old coat hanger, cut off the end, and fed it through carefully.
Once through I put a wire in it and squished it nice and tight. Tight.
There's barely enough room for what's in there already.
I pulled my wire through.
I was smart... lucky enough that when I pulled it through the two cut ends were on the switch box side.
I used my soldering iron to remove my red and white wire from the pass switch and soldered my new wires.
After much experimenting I cut the exposed end off the red wire and wrapped it with tape.
I took the white wire and soldered it to the white wire on the rocker switch for high/low beams.
I tucked it all back together (somehow), re routed the wire bundle, and back into the headlight housing.
I was complaining of warbling sound after I did the HID the first time so I mounted the ballast on a bracket.
Now, I cut the wires I added in. Opened the garage door opener, and soldered them in to switch 4.
I used the soldering iron to melt the case a little bit so I could close it with the wires sticking out.
Then secured it with a ziptie.
The end result is I click the pass button to open my garage door now.
Now, the stock bulb is a 55/60 watt. At 12 volt it's a 5 amp draw. The HID's draw almost half that so I'm not worried about drawing too much current through the wire. The HID only draws peak current during the inrush of initial startup. This is why I don't advise doing this: on a stock bulb you'd be pulling high 9 amps.
I wanted to put a diode near the relay to reduce the load on the wiring but I couldn't isolate what I needed because my diagrams were all different colors than what my bike is.
Anyway, my lights are bright and I can open my garage door.