Rear gear upper fill bolt for 1800 honda goldwing 2003

SOURCE: Honda Goldwing rear side compartment stuck closed.

The 2001 model had a problem with the left compartment. In your main trunk you will find on the left and right side a black button insert, pop it out and with your finger you can push the mechanism down, this will open the compartment. I had to tear into the locking mechanism and shortened a new rod to cure my problem, hope you don't have to go to this extent to cure your problem

SOURCE: installing rear speakers & fader on a 1500 goldwing

inside the fairing at the radio

SOURCE: how do you remove the seat from honda goldwing 1997 gl1500??

You have Two Handles on the side of the seat... The allen bolts are in the handle... The bolts that hold the handle also hold the seat.... Remove all 4 bolt, Lift off seat from the rear. The front of the seat has a slide that goes in a grove

SOURCE: Replace front speakers

I ran into this problem myself, the instructions make it sound easy.
Remove the speaker grills. just pry from the top with a credit card. take out the allen screws on each side. pull up on the lower part of the dash to the rear of the key. After this pops up, there is a plug attached behind the ignition lock cylinder. Use a screwdriver to pry the latch out and unplug. 
Now the hard part. The instructions say to just take out the screws, the dash gets in the way. I was not willing to disassemble the entire fairing. I used a soldering iron to melt the plastic enough to get a screwdriver in, but not so much that it was visible after the dash was back in place.
The screws expand when you tighten them, like the plug on a boat. you may have to hold the outside while you turn the screw. DON'T LET THEM FALL DOWN THE FAIRING!!! This can take hours to remedy. frankly you are better to get a new anchor than to try and take apart the fairing.

SOURCE: how to install mp3 player on 2003 honda goldwing

Remove the push in pins for left fairing pocket, pull out the glove box, look under where it was, there is a aux input wire ,unwrap it and install through the bottom of the glovebox.reinstall box with push pins.You have a button on the radio to choose your new input source.