OK.
You do not have to put any wires together to have it run. With the switch completly disconnected, the trike will start with the kicker, and the kill switch on the left handle bar cluster will kill the motor. You will have to be in neutral for it to start, the 250sx has a wierd interlock because of the electric starter.
for the quick fix.
Put a toggle switch (or even a jumper wire) between the Red and the Black wires ( I think they are bigger too). Connecting these two wires together will allow the electric starter to work, and the lights. Connecting the other two wires cause the motor to stop when the key is turned off. Leave them disconnected and use the kill switch.
If you do this, make sure the neutral light comes on. As I said above, this trike will not start without the neutral safety switch closed. This and the reverse light switch are under a little cover flap low down on the right hand side of the motor (kinda under the foot brake pedal). If these wires are broken you will get no joy.
ATCnut
82 185s - sold
83 200x (hopped up)
84 200x (stock)
84 70 (lost this one to the DMV)
85 70 (soon to have lights, a foot brake, and CDI ignition)
84 200es (parts trike) - sold
85 350X (the best)
85 350X (siezed motor, dream of a poweroll kit someday)
85 250sx (frame was trash, got parted out)
86 250sx (the tractor)
86 250sx (a nicer tractor)
86 250sx (an even nicer tractor)
87 200x (parts trike, its really rough, a dog was chewing on it for a while)
87 250es Big Red (the tank!!)