No response when starting

[deerfoot52]

I recently bought a 2006 Ag King 3540. When I tested it, the gauges worked and the idiot lights lit up when I turned the key to the on position, and the motor started right up when I turned the key further to the start position (and depressed the clutch).
When I got it home, the gauges worked, then they didn't, then they did. Then they stopped working all together, except the ammeter.
I replace the ignition switch (the original owner had broken off the key in it).
That did not fix the gauges, but sometimes I would have an oil pressure lite.
Then yesterday, after starting and stopping it 4 or 5 times, I forgot to turn off the switch. I tried starting it (depressing the clutch every time) - nothing.
No lites, no gauges, no starter. No hum, no click, nothing.
Cleaned the battery contact, charged the battery, checked the fuses. Still no response.
I jumped the tractor off my big V8 Jeep. Got an oil lite. The directionals worked. Turned it off, then on, Nothing. No lites, no starter.
What am I missing? Relay, solenoid, fortune cookie?

My mechanic told me there was a circuit board under the dash. Could that be flaky? Would that prevent the starter from engaging?

 

[greg_g]

Not the circuit board, more likely the fuse box. The electrical systems on Chinese tractors are not very impressive. The fact that it's currently dead is likely because the 30A system fuse blew. But something caused that, and often it's flakey wiring right at the fuse box itself. I'd start by pulling all the fuses, validating all the input and output wiring at the box, then replacing all the fuses with aftermarket equivalents.

Also, make sure the clutch interlock switch and associated wires (underneath the left floorboard) are in good shape. A short in that circuit wil take out the system fuse in less than a heartbeat

//greg//

 

[deerfoot52]

Thanks, Greg. I will definitely check out the clutch interlock switch and wiring. That's the only thing I haven't eyeballed.