John Deere 5103E - Manual (Page 166)

Troubleshooting
PY80265,05GO991 –19–10SEP05–2/2
Symptom Problem Solution
Entire electrical system does not Faulty battery connections. Clean and tighten connections.
function
Sulfated or worn-out battery. Check electrolyte level and specific
gravity.
Blown fuse. Replace fuse.
Relay(s) sticking or Diode to protect circuit from arcing See your John Deere dealer.
nonfunctional; repeated failures has failed.
145-9
022607
PN=164