Have a 71 JD 4320 with cab heat and air, everything was fine until today. Started it and ran it out of the shed to do some spraying. Shut it off for a minute and all the accesserie stayed on, radio, fans spray monitor everything but the engine. Had to diconect the batery to shut everything off. Thought well must be the key switch. Put in a new swithch and the same problem. Can,t even start the tractor by jumping the starter. Key switch does nothing, if you turn the key to the start position everthing goes dead for about 10 seconds then the radio comes back on. Tried everything I can think of traced all the wires cannot find a bad one anywhere. Anybody have an idea I missed. Thanks
 

First off what kind of cab JD Roll-Gard or other aftermarket brand???? Parts schematic shows 2 different accessory relays and 1 starting relay either of which could have failed. Or starting problem could also be neutral start switch related.
 

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