Are there any issues with powering pins 85 and 30 from the same 12v wire? The starter on my friend's 1981 Yamaha XS45 was not working, so I upgraded to a modern solenoid. I followed all the wired with a multimeter and figured out how to hook up the relay and got everything to work, but from the old set up I only had one wire with 12v power, so I hooked it up to pins 85 and 30. This means I had one wire left over from the old set up and for the life of me I can't figure out what it does. It's not 12v and it's not ground. I've all electrical components (e.g., turn signals, brake lights, etc.,) on the motorcycle and everything works.
P.S. I did the same thing with the headlamp - again left over with an extra wire.