Electrical System Troubleshooting

SymptomProblemSolution

Battery will not charge

Loose or corroded connections.

Clean and tighten connections.

 

Sulfated or worn-out battery.

Check electrolyte level and specific gravity.

 

Loose or defective alternator/fan belt.

Adjust belt tension or replace belt.

Charging system indicator glows with engine running

Low engine speed.

Increase speed.

 

Defective battery.

Check electrolyte level and specific gravity.

 

Defective alternator.

See your John Deere dealer.

 

Slipping alternator/fan belt.

Adjust belt tension.

Starter cranks slowly

Low battery output.

Check electrolyte level and specific gravity.

 

Crankcase oil too heavy.

Use proper viscosity oil.

 

Loose or corroded connections.

Clean and tighten loose connections.

Light system does not function; rest of electrical system functions

Blown fuse.

Replace fuse.

Entire electrical system does not function

Faulty battery connections.

Clean and tighten connections.

 

Sulfated or worn-out battery.

Check electrolyte level and specific gravity.

 

Blown fuse.

Replace fuse.

Relay(s) sticking or nonfunctional; repeated failures

Diode to protect circuit from arcing has failed.

See your John Deere dealer.

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