I really need to write some sort of tech article on this install, it would really save me some time... Anyhoo... if you search around the forum you should find a complete write up on the install of an 1800 goldwing switch on a ST1300. I personally didn't like the size of that particular switch (or the price) so I personally put a GL1500 switch on my ST1100. It is a little smaller but it is not backlit like the 1800 one. I was cool with that because after about 2 seconds you can memorize what switch is where and should you really be looking at your hands anyway? The GL1500 switches are readily available on ebay relatively cheap for used ones or you can get a new one on there for quite a bit more. I bought a used one and it looked it. I was able to clean it up well and it ended up matching my old bike pretty nicely. I will say though, make sure you study the pictures of the used ones before you purchase! The other advantage of the GL1500 switch on an ST1100 is that the bikes were made at the same time so the wiring is plug and play. Both switches utilize the same 9 connector hitachi plug for standard right switch functions. The GL switch also has an additional 6 connector plug which contains the cruise functions. (Much like the police switch) The only wiring change in the main harness was to reverse the positions of the kill switch wires. (as mentioned, you may not have to do this) Otherwise everything will work except the kill switch. There are 4 connectors outside the body of the switch, two are for the brake light switch while the other two are meant for an additional switch only the Goldwing has and aren't used on the ST. The 6 wire connector contains 1-12v wire "in" to the cruise switch, 1-12v "out" for turning the cruise control on/off, one wire each for resume/accel and set/decel, and those two extra wires mentioned earlier. The wiring in your case will go like this..
The first color listed will be from the CCS (murph) and the second will be the GL Switch.
Green to white w/yellow stripe
Brown to black w/yellow stripe
Yellow to white w/blue stripe
Orange to white
Hope this helps. I love the gl switch on my st. it looks completely factory and only somebody who knows better would even think it wasn't. the only other things to consider is that there may be clearance issues if you don't have risers due to the size of the switch. I personally have 4" risers and have plenty of room to spare at full right lock between the gl switch and the "tank". And lastly, the gl switches wiring is about 4 times longer than the st's. I cut out the extra but you might be able to stuff it somewhere. Any other questions, just let me know.
