I am not trying to bash what wmsonta is saying but actually after studying the circuit it has nothing to do with the switch or the wire, it has to do with the safety features that is connected to the starting circuit. If you will follow the circuit through you will find that the coil side of the relay in the junction box has to make ground in order for the circuit to be completed thus causing the solenoid in the relay to energize and switch the switch or voltage to the starter solenoid. If you will follow the black w/red strip it goes to the JB and then comes out yellow w/red strip going to the starting solenoid. Both wires are the same diameter, but the insulation jacket is thicker on the black wire than on the yellow thus making the appearance to be bigger on the black than on the yellow.
It is a good concept of saving wire but it is for a safety feature not saving wire. I have been an electronic tech for 22 years and owned my on Pro Audio shop for 14 years where we use relays (solenoids) on an everyday basis. This on the bike is the same just different.
I have been riding bikes for over 30 years. Before I crank any bike on instinct I either pull in the clutch or put it in neutral to crank the bike and after almost going down the side of a mountain I am careful to put up the kickstand. But for those who are careless or new I don't recommend bypassing the safety features and get another junction box.
wmsonta is correct when saving things are concern but it isn't in this case. What a relay generally does is it takes a smaller wire with smaller voltage to switch a larger voltage, for example. If you want to apply 220 volts ac but you don't want to put a 220 volt ac switch which is more costly, you put a relay in place with a smaller switch that will work with say 5 volts dc. It will do the same, but cost less.
Last edited by mrseedsower; 07-20-2014 at 04:55 AM.