Does the tank shroud need to come off to do this fix?
In other words, is the start relay under the seat or is it near to the headlight?
This file give you relay locations, but for the starter relay I confirm by feeling the relay energize when I press the start button. https://www.guzzitech.com/forums/resources/breva-1100-general-service-manual.24/
Also the yellow wire going to the relay is a good indicator.