MacDon M1240 - Page 511

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7.2 Electrical Troubleshooting
Problem Solution
Section
Symptom: Low voltage and/or the battery will not charge.
Defective battery
Have battery tested.
5.14.1 Batteries, page 427
Loose or corroded connections
Clean and tighten battery connections.
Maintaining Battery, page 427
Defective alternator belt
Replace worn belt.
Replacing Engine Fan Drive Belt, page
443
Alternator or voltage regulator not
connected properly
Connect properly.
5.14.1 Batteries, page 427
Dirty or defective alternator, defective
voltage regulator, or high resistance in
circuit
Contact Dealer.
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Symptom: Lights dim.
High resistance in circuit or poor
ground on lights
Check the wiring circuit for a break in
a wire or a poor ground.
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Symptom: Lights do not light.
Burned out or defective light bulb Replace light bulb.
Replacing Headlight Bulb – Engine-
Forward, page 452
Burned out or defective light bulb Replace light bulb.
Replacing Bulbs in Standard Work
Lights or Cab-Forward Headlights,
page 451
Burned out or defective light bulb Replace light bulb.
Replacing LED Lights – Deluxe Cab
Only, page 454
Burned out or defective light bulb Replace light bulb.
Replacing Bulbs in Red and Amber
Lights, page 456
Burned out or defective light bulb
Replace light bulb. Replacing Red Tail Lights, page 457
Burned out or defective light bulb Replace light bulb. Replacing Beacon Lights, page 458
Burned out or defective light bulb
Replace light bulb. Replacing Cabin Dome Bulb, page 458
Broken wiring
Check wiring for broken wire or
shorts.
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Poor ground on lights Clean and tighten ground wires.
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Open or defective circuit breaker
Check circuit breaker.
5.15.7 Accessing Circuit Breakers and
Fuses, page 461
Defective relay Replace relay.
Replacing Circuit Breakers and Relays,
page 463
Symptom: Wrong turn signal/indicator lights activated.
Reversed wiring
Contact Dealer.
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Symptom: No current to tab.
Broken or disconnected wire Contact Dealer.
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Circuit breaker tripped Breaker automatically resets.
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TROUBLESHOOTING