110
Rev 4/2018
Symptom Problem Solution
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.
Defective light switch Replace switch.
Poor ground Check ground cable under cab, and
between engine and main frame,
for loose connection or corrosion.
Lights will not light
Defective light switch Replace switch.
Open wiring, circuit breaker, or
fuse
Check wiring for broken wire or
shorts. Check circuit breaker or
fuse.
Defective light Replace.
Poor ground Check ground cable under cab, and
between engine and main frame,
for loose connection or corrosion.
Turn signals do not operate
Controller faulty Replace warning light display.
Defective light Replace light.
Open wiring or fuse Check wiring and replace fuse.
Defective relay Replace relay.
Poor ground Check ground cable under cab, and
between engine and main frame,
for loose connection or corrosion.
Warning lights do not operate
Controller faulty Replace warning light display.
Defective relay Replace relay.
Open wiring or fuse Check wiring and replace fuse.
Defective light Replace light.
ELECTRICAL
Electrical