I installed a weatherproof 12V DC socket on the underside of the dash for operation of my GPS using one of DennisB's GPS mounts. No Tupperware needs to be removed or even loosened.
1) Remove battery cover under seat.
2) Disconnect battery leads.
3) Using #12 or #14 wire, push the wires through the hole beside the -ve battery cable.
4) Remove the left hand passenger peg plate.(large Allen key)
5) Feed both cables through the large opening in front of the rear tire and fender to the opposite side of the scooter.
6) Remove the right side passenger peg plate.
7) Feed both cables forward to the opening in the bottom of the right front fairing. I used an old electrical fish tape to feed through the cables. From there, I pushed the cables up to an opening behind the front wheel at the left top of the radiator.
Remove the right storage bin on the dash by squeezing the sides together while pulling upwards. This is also how you access the radiator cap.
9) Using the fish tape again push the cables up to the area where the storage bin was. Now you have access to a large area behind the fairing and dash where you can work.
10) I bought a weatherproof 12V DC socket at WalMart that screws to any mounting surface. I drilled 4 holes in the underside of the dash just to the left of the storage area.
11) Back to the hookup at the battery. I decided to install a small toggle switch to control the power socket. I did not want it hot all the time. I drilled a small hole in the top of the battery cover to allow the toggle to poke through the cover. If you use common sense where to locate this switch above the battery, you will see there is lots of room for this switch and its wiring.
12) I attached a ring lug to the +ve power cable and attached it to the battery terminal. I switched the -ve power cable, and then attached another ring lug for the jumper cable from the switch to the battery lug. You can switch whichever wire you like. I also fused both the -ve and +ve power cables with separate 20A fuses, only because I'm anal.
The reason I switched the outlet was to avoid anyone tampering with the electrical if I was away from the bike. Also, I can plug my battery tender directly into the outlet to charge the battery without having to remove the battery cover.
Any questions, please ask. I'll try and post some pics when I'm done my other mods.

Bigbird,

Thanks for the instructions, I'm sure they will help me install one too. I keep saying I'm going to do this but I just never do. How long did it take you do you think? Thanks.

Well, I pulled out the Walmart piece of junk weatherproof DC power accessory I had installed. It started to short out the fuse in my GPS power adapter. I assume the center positive terminal was shorting out to the negative ring inside the plug.

I bought and installed this:
http://wingstuff.com/pgroup_detail/402_Power_Plug/3622_GL1800_Accessory_Fairing_Power_Plug_Socket/?goto=%2Fpgroup_list%2Felectronics%2F402_goldwing_Power_Plug%2Fdes%2F

It works perfectly and is constructed very differently internally. It looks like it would be very difficult to short this out. I drilled a 7/8" hole with a spade bit in the lower dash area beside the right storage bin. I removed the bin and wired the new power point in. It points down so it is fairly weatherproof and is much more integrated looking than the old one. Also the spring for the weatherproof door on the old powerpoint was very strong, and installing an adapter into the port was not that easy. You can see a picture of the old powerpoint in my album. I'll post a pic of the new powerpoint soon.

Pictures or the new power plug are now added to my album.

bigbird,

That looks like a good place for one. I keep meaning to go out and try to put one in but I seem to always get busy. The last time I tried to plan it out was when I tried to change my oil. I couldn't get the drain plug out since it was stripping so I just put the new filter in and filled it up with oil that i drained by removing the filter. I still don't know what I'm going to do about the drain plug.

But I just may put the plug where you put yours. It seems to be pretty weatherproof and it doens't rain out here much at all either. Thanks.

Update: DO NOT put an accessory 12V DC receptacle where I suggested. Here's why.

Today I was out of the big city for an all day ride. We were 150 km from home. We went into a coffee shop in a very small town. Before parking, the owner of another Swing in our group said to put the parking brake on whenever the Swing is on the sidestand to prevent a strong wind from moving the Swing. I thought nothing of it, put the parking brake on, and went in for coffee. A half hour later my Swing battery was totally dead, no lights, instruments, and for sure no starter. I boosted my battery from the other Swing and it started instantly. That was the end of our trip and I headed back to the Honda service dep't thinking I had a defective battery.

They took it in immediately and the tech load tested the battery, checked the stator output of the alternator, and could find nothing wrong. He blamed a loose switch I installed in the battery box that controls this accessory circuit.

After thinking for awhile I knew there was no way a defective under seat switch could short the battery. If the wires from the switch came totally loose, they were ground wires. They would have to come in direct contact with the + battery terminal. No way. The switch simply interrupted the negative ground wire. The tech was wrong.

After getting home, no charge for the tech's diagnostic time by the way, I pulled out the right storage bin where the DC receptacle was located. Everything looked OK until I pulled the parking brake lever. Eureka! The painted black steel of the mechanism for the parking brake came in contact with the center pole (+) of the DC receptacle. There was the short! The fuse for the DC accessory circuit never blew because the parking brake steel was painted, not bare. If it had been bare, the fuse would have instantly blown and I would still have a charged battery.

Now I will relocate the DC accessory receptacle to where it belongs; inside the left lockable storage bin. I will unfortunately have to remove the windshield garnish, windshield, lower cover, and front cover. While the front cover is off I'll install the HyperPro springs. Two birds with one stone. That way I can get the fork caps loose without using an impact gun or putting them in a vise, and I can properly torque the pinch bolts for the forks.

So, if you have your DC receptacle mounted beside the right storage bin, make absolutely sure that when you pull the parking brake lever that no metal contacts the center pole of the receptacle. Otherwise, you'll be cursing just like I was.

That's very bad luck, bigbird.
Glad you found out what the problem was without starting a fire!

Bigbird: It takes a special person to admit their mistakes. Even with all your experience and expertise, you got something wrong. I like the way you admitted it, and passed the heads up on to others. That's what makes this forum so good. Kudos to you!

I'm glad I checked here. I, too, want to add a 12volt socket. I saw there is a place in the lockable pocket, already there. I took off the front garnish, figuring I could access the backside of the hole, but not even close. I figured more had to come off. That's why I checked here first. Thanks for the help.