MS1700 put a nice picture in his post of the starter relay. The red wire that is disconnected is the wire from the positive battery post; connect a voltmeter black wire to the frame and touch the red meter wire to the end of the big red wire in the pic. If it shows 12 volts that is good, if no volts then you have one of four connections is the problem; the neter isn't properly grounded, the other end of the big red wire isn't properly connected to the battery, the battery ground wire isn't properly connected to the battery or the other end of the battery ground wire isn't properly grounded to the frame.
There are 2 fuses in the picture one is the main fuse for the bike the other is a spare. Between the two fuses is a plug with 4 wires, 2 of which you can see in the pic. With the big red wire hooked up; the 2 wires that are out of sight should have 12 volts with the key off, and the 2 wires that you can see should have 12 volts with the key on.
The other big wire is the wire to the starter. When you push the start button the relay internally connects the two big wires and the starter works.
If you have 12 volts at the big red wire, but not at the 2 small red wires then the "operational" fuse is no good or the relay is no good.

Clifford