I just looked at the LS, (it's got the tank off) .
On the right side of the 'backbone' tube, there's a large sheet metal bracket with two relays secured with screws at forward end of the bracket .
One of the relays should have a plastic case (the LS has a grey case) with a wiring schematic molded into the plastic case, and the other relay is a little shorter, and has a metal cover, it's the lighting relay, it's what shuts off the headlight when you use the starter .
The plastic case relay with the schematic, is the starter relay .