JD 5100 electrical question

[Allpete Farm]

My JD 5100 12v plug in the cab has no power. I purchased used low time tractor. I have no idea where to start. Does anyone have any schematic or something I can use to troubleshoot?

 

[CH4Ohio]

Pull it out of the socket or get behind it and see if there's power at the terminals and a good ground. Trace the wire back from there IF you can. If it just goes into a bundle, you probably can't. Check all fuses.

Easy fix would be to run a new wire to the battery or fuse block. Sorry, can't help with the schematic but that's where I'd start to troubleshoot.

 

[Roadworthy]

I'd start with the fuse, too. The outlet may only have power with the key in the on position so try that, too.