On my Stelvio, I used a 40 amp relay from the parts store, some spade end connectors, a bit of wire, and an inline fuse to create my own version that requires no cutting or splicing of the factory wires. I ran a fused hot lead from the battery to the relay, and on down to the starter. The wire I pulled off the starter is now the trigger lead on the relay. I could eliminate it all in about 5 minutes and be back to original. Of course a ground lead on the relay to complete the trigger circuit. Although I was not having any trouble, I decided to do it one day last year as a pre-emptive measure.
(The startus interuptus I bought from MPH could not be used on my Stelvio because the wiring was different. I gave that to a local friend with a Griso.)
Point is, no wires need be cut.
John Henry