B7800 not cranking. Alternator light not coming on with key

[AlaskanMan]

2002 Kubota B7800 was being used. Parked for the night. Next morning I went to start. Only one red light with key. Glow plug light comes on as normal. I can jump the starter and it cranks and runs. Where should I look to get normal starting?

 

[bczoom]

Battery is good?

This has happened to me a few times. On all occasions, it was the battery cables. They corrode internally (so you can't see it) but they can carry enough volts to give you lights but no amps to start the tractor.