Kubota Z125EBR was obtained in a trade for a 4 wheeler that I got for free,anyway when I got it it wasn’t starting,someone wired the ignition switch wrong,still wouldn’t start,checked all safety switches, replaced parking brake switch,still no start no click.. then I checked the small blue wire to solenoid,wasn’t getting continuity to ign switch,then I found there’s a diode under the seat in the wiring harness wire at the ignition switch was white . After the diode it was blue,(changed colors, replaced diode, then it started, after that, I replaced the relays, because 1 was a 5 pole the other was a 4, for my model it takes a 5 pole… then went to replaced the sub pump, then it would not start again, then it started working again … then I washed the motor,started but didn’t run, replace carbeator, started running again, then replaced rear writes, then no start again.. then it started again with no problems, then it acted like the solenoid was bad, touched the wires to the solenoid and it started, so I bought a solenoid, the right after installing. I pulled the small blue and red stripe wire and the connector came off, so out of all my problems it was a tiny wire causing the problem the whole time.. so always check the simple things!!!