A member on this forum asked if I could provide him with some information on how to connect a Electrical Connection Trailer Isolation Relay on a ST1300.
I decided to draw a little wiring diagram with the correct color codes to make it easier.
For those who are not familiar with isolation relays, they act as a barrier between the motorcycle's wiring system and the trailer wiring. So anything can happen to the trailer, like short circuits, and it will not affect the motorcycle systems in any way. Some have them, many think they are not necessary. In any case, I sleep better knowing my trailer install cannot hurt the motorcycle's electronical systems.
If anybody spots a mistake in the diagram or want to improve upon it, please let me know and I'll be happy to add your input.