The connectors that were used on these old GS's were predominately Molex connectors. Time has improved the technology and I will share a link with you.
The following source is a pretty cost effective way to replace those pesky Molex connectors (White, Green and Blue) that tend to crumble with age.
Use General Motors Delphi division's WeatherPak connectors, weather-proof with seals. These can be had (for a bit of a steep price) with the pigtails included. That is there is a connector that already has the wire crimped to the the connectors and seals and these are already seated into the connectors for you. You will pay extra for this... OR
You could go to this website and pay for the crimping tool, the extraction tool and the separate components.
You basicall slide a seal over the end of the wire that you want to terminate, then strip off 3/16-inch and then terminate that wire with the crimp tool, then crimp the seal with that same crimp tool and insert the Pin/Socket into the proper housing and Pin/Socket position.
This WILL cure the majority of your wiring problems.
These same connection can be had a a pigtailed pre-assembled package and you would simply cut your Molex connectors out of the harness and replace with the respective WeatherPak connector by using bare metal Butt Splice connectors, crimping into place (after sliding Heatshrink tubing over the individual wires). After crimping I solder the connection making sure that the solder is wicked into the Butt Splice Connection, and then apply some liquid electrical tape to cover all metal exposed parts, Then heat shrink this extending 1/2-inch out from the ends of the Butt Splice connector. You are good to go.
Here is a link for the pigtail WeatherPak connectors....
For a one stop connection there is an eBay outfit that will sell a kit for all you need for one bike
and the crimp tool
The two links above will suffice for most of anything you might need to fix any problems with wiring harnesses.
Not exactly cheap, but peace of mind is worth something.
[edit] Some (legitimate) concerns were raised in this thread and so I thought that the easiest way to add to the knowledge base was to edit this post and offer some additiional methodologies for splicing wires together.
Namely Tyco's Soldersleeve
Here is Digikey's Catalog Page...
No crimping required, simple and straightforward process, clear shrink tubing allows inspection at later dates if desired.
There are many ways to skin a cat, if done properly most any of these methods will work for you, if done improperly, most of these methods will fail for you.
I will simply add to this post from time to time to give the dear reader options that should suffice to get the your particular job done to your satisifaction level.
For instance, the Soldersleeve's work quite nicely with regards to integrity and reduced bundle size. By the way, Microtorches work very well on these kinds of repairs, you can take some of these splices with you in your tool kit, and be the darling of the techno geeks when some poor slob has a wiring melt down on the side of the road. Whip out the ultra cool torch, a bit of wire, your handy dandy T-Stripper ( http://www.mytoolstore.com/ideal/ide11-03.html ) and volia!
Triple Distilled Polish Potato Vodka cocktails all around!
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