
6.2
Electrical Troubleshooting
Symptom
Problem
Solution
Section
Defective battery
Have battery tested.
Loose or corroded
connections
Clean and tighten battery connections.
Defective alternator belt
Replace worn belt.
Alternator or voltage regulator
not connected properly
Connect properly.
Low voltage and/or
battery will not
charge.
Dirty or defective alternator,
defective voltage regulator, or
high resistance in circuit
Defective light switch
Contact Dealer.
Contact Dealer.
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.
—
Replacing Field
Light Bulb, page
270
Replacing Bulb
in Cab-Forward
Flood Light, page
270
Beacons (if
installed), page
277
Burned out or defective
light bulb
Replace light bulb.
Replacing HID
Lamp (if Installed),
page 273
Broken wiring
Check wiring for broken wire or shorts.
Poor ground on lights
Clean and tighten ground wires.
—
Open or defective circuit
breaker
Check circuit breaker.
Circuit Breakers
and Fuses, page
282
Defective relay
Replace relay.
Replacing Circuit
Breakers and
Relays, page 283
Lights do not light.
Defective light switch
Contact Dealer.
Contact Dealer.
169890
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Revision A
Summary of Contents for M105
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