Toro Timecutter SS5000 - starter keeps running with key off

Cleaned and tested continuity for ground to motor and for brake switch. All tested good. Re-tested starting the motor. Same issue. But...I thought 4 post solenoids didn't matter if they were grounded. Wouldn't work if not grounded. When I grounded it and starter kept running even with key off, I lifted solenoid off mower frame and starter shut down. I reversed the battery and starter wires on the solenoid to see if that mattered, and same issue. Solenoid did not work if not grounded, but when grounded starter keeps running until ground is interrupted. Beginning to wonder if possibly the new brake controller is defective? I watched when key in run position, the brakes disengage when steering levers are moved. So it appears to work that way...
 
And it is a good possibility if you did replace the wiring at the same time. They won't cover it you didn't. Remove the blue wire at the brake controller and test.

May not fire up but the starter should now stop when not in start position.
 
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Traced blue wire from brake controller up to ignition switch. Disconnected at that point. No power to starter. But when reconnected and turned key, starter engaged. When disconnected while starter running, the starter kept going until I
 
Read my text carefully. I did not say disconnect at the ignition switch, I said disconnect at the brake controller. I thinking you are getting a feedback relay latching voltage from the brake controller which is creating a holding voltage at the solenoid.

If this is happening then the brake controller is bad. Then you could try installing a steering diode at the brake controller to prevent this feedback but this only masks the problem.

All remote starter solenoids are relays.
 
Gotcha. I'll do that as soon as I can. Thank you for the clarity. I get the basics of electricity, but struggle with understanding how feedback and diodes work.
 
It sounds like the starter solenoid is getting power from the "on" power source. What happens when you turn the ignition switch to on without going to start. Does the starter run?. If it does, the starter switch is bad or the on and start wires are connecting somewhere. Just a thought!
 
Haven't been able to get back to mower for a day or so. Planning to make time later today, I hope.
When ignition switch turned to run, without going to "start" position, there is no power to the starter. It only gets power when turned to start. Once in start position, power remains to starter even when switch turned off, until I interrupt the ground.

I just finished reconnecting blue wire at switch, and I cut the blue wire between the solenoid and the brake controller. With the blue wire disconnected from the switch, the solenoid buzzes, then starter engages and engine will start. It does act like not quite enough power to solenoid and ignition with blue wire disconnected. But if I reconnect the wire, the engine starts and starter stays running until I disconnect the wire to the brake controller. But, when blue wire disconnected from brake controller, the engine stays running, and turns off with key.
 
Clarifying... With the blue wire disconnected from the "brake controller", the solenoid buzzes.... I had typed "switch" which sounds like the ignition switch...

With blue wire disconnected from the brake controller, the solenoid will buzz for a moment, then starter will engage and engine will start, but sluggishly, like ignition weak...
 
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