Want start by key

[lastoja 43]

I have replaced key switch relay and solenoid and get nothing. I found oil safety switch was bad so I jumped it I check oil always befoRe starting. Since I have done this I get relay the relay to click. It will start by jumping lugs on solenoid and cut off by key. I also found someone already had jump neutral switch out and I know seat switch works.could starting side of pto switch be bad and how can I check.

[gwest_ca-(File Mod) 11,090]

I replied in this thread

Garry

[953 nut 55,709]

       It would be helpful to know what year and model you have, not all  are wired the same.

With any electrical problem the first step is to clean and tighten all electrical connections.

[lastoja 43]

It is a 1986 312-A # 21-12KE01 I also have a C101 that has been best I have ever own.

[953 nut 55,709]

Here is the owner's manual with wiring diagram.

 

[953 nut 55,709]

I don't own this particular model, but the 310 and 312 that I own both have two small wires going to the solenoid, one is a ground and the other comes from the ignition switch.

Your wiring diagram shows that the wire to the switch is routed through the clutch pedal switch and the POT switch and then to a relay. Clutch must be depressed and PTO off. Be sure the ground wire is connected to the solenoid. With the transmission in neutral take a small jumper wire from the battery "+" to the small purple wire at the solenoid, if it closes and the engine turns over then it is good. If not, back up to the next component and so forth until you find the problem.

 

Edited June 7, 2017 by 953 nut

[gwest_ca-(File Mod) 11,090]

Look this wiring over

There are 2 illustration for the starter circuit. The low oil switch powers the relay when the oil is low and opens the circuit to the starter solenoid.- starter no worky

 

Garry