A follow up on the JD 5303. It was the cold cranking senor that's mounted in the thermostat housing. When it goes bad it will blow the fuse, the fuse on the 5303 is the blinker fuse and it supplies the injector pump with 12 volts. My book does not tell me this. Here where I live, might not even need to replace the senor, but I did just in case. It will crank and run, but if it get cold enough, then you will need the senor. I might be the only one on here that didn't know this, but I will put what I found out here just in case someone has the same problem and thanks to ones that helped out.
Wayne
 

Thanks for update. That cold start sensor has been causing blown fuses since the mid to late 90's since the introduction of the JD 5000 series tractors.
 

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