Electrical System Troubleshooting

SymptomProblemSolution

Battery will not charge

Loose or corroded connections.

Clean and tighten connections.
 

Sulfated or worn-out battery.

Replace battery.
 

Loose or defective fan belt.

Adjust belt tension or replace belt.

Charging system indicator glows with engine running

Low engine speed.

Increase speed.
 

Defective battery.

Replace battery.
 

Defective alternator.

See your John Deere dealer.
 

Slipping fan belt.

Tighten belt.

Starter inoperative

Gear shift lever in gear.

Move lever to neutral.
 

PTO lever in engaged position.

Move PTO lever to disengaged position.
 

Low battery output.

Charge or replace battery.
 

Blown fuse.

Replace fuse.

Starter cranks slowly

Low battery output.

Charge or replace battery.
 

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 connection.

Clean and tighten connections.
 

Sulfated or worn-out batteries.

Replace battery.
 

Blown fuse.

Replace fuse.

Relay(s) sticking or nonfunctional; repeated failures

Diode to protect circuit from arcing has failed.

Replace diode module.

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