If you are talking about the one in between the brake-switch and main relay. That seems to be some sort of secondary relay. That relay only comes on if the main relay is triggered. That one allows the starting system to work, that's why I said the black and red wires have to be connected so the yellow/red one can work.
When the black and red wires touch, the black is now hot and the break switch wire is connected to it now it is hot too. Since you've bypassed the break switch and connected those wires together as soon as the black and red at the ignition are touching that relay is also turned on allowing the yello/red wire to be able to complete it's circuit to the starter solenoid once you touch it to the black and red wires at the ignition.
I know it can be a bit confusing but after thinking of the relay as an electric on/off switch it gets easy. Two of the wires turn it on pos and neg, and the other two wires (top and bottom) are allowed to connect.
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T.J.
Yerfdog Spiderbox, Uni Type air filter with 6" intake, 130 jet, Orange no-rev limit cdi, Red coil, iridium plug, 1500rpm clutch springs, 1500rpm contra spring, 13g sliders, 22" rears, 21" fronts, aftermarket reverse installed, and Trailtech Vapor.
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