Power comes out of the SSCB on the orange wire - the orange wire goes to the key switch - when the key switch is turned on, power comes out of the switch on the red/blk wire and goes to the LH switch assy - power comes out of the LH switch on the red/wht wire and goes to a 6 wire splice (#1) - from the splice; (#2) red/wht wire back to the key switch, (#3) goes to the neutral switch, (#4) goes to the SSCB, (#5) goes to the CDI unit, (#6) goes to the reverse limiter - when the key switch is turned to the start position, power comes out of the switch on the wht/red wire and goes to the solenoid to initiate the starter motor. The tie in to the neutral switch is; power goes in on the r/w wire and comes out on the dark green when in neutral, out on violet when in reverse and out on grey/white when in HIGH range - when in neutral, power from the r/w wire is on the gark green wire - the dg wire goes to a 3 way splice: (#1) power in, (#2) goes to the neutral light and (#3) goes to the SSCB. If you replaced the SSCB, then the problem is probably at one of the splices and if the neutral light is on whenever it is in neutral, then the problem must be the dark green wire splice or a ground issue. Power must be on the red/wht wire before it is on the dark green wire. If playing with the gear shift seems to alleviate the problem, it has to be intermittant power on the dg wire at the SSCB, a faulty ground (brown wire) at the SSCB or a faulty SSCB.
I hope this helps
Shop Owner and Mechanic with over 50 years experience