MacDon M155 Operators Manual - Manual (Page 409)

TROUBLESHOOTING
6.2 Electrical Troubleshooting
Symptom Problem Solution Section
Defective battery Have battery tested. Battery, page 326
Loose or corroded
connections
Clean and tighten battery connections.
Maintaining the
Battery, page 327
Defective alternator belt Replace worn belt.
Replacing Fan
Belt, page 323
Alternator or voltage regulator
not connected properly
Connect properly. Battery, page 326
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
Headlight Bulb,
page 337
Replacing Bulb
in Cab-Forward
Flood Light, page
340
Burned out or defective light
bulb
Replace light bulb.
Replacing Bulb in
Rear Flood Light,
page 345
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
354
Defective relay Replace relay
Replacing Circuit
Breakers and
Relays, page 355
Lights do not light
Defective light switch Contact Dealer Contact Dealer.
Turn signals or
indicators showing
wrong direction
Reversed wires Contact Dealer Contact Dealer.
Broken or disconnected wire Contact Dealer Contact Dealer.
Circuit breaker tripped Breaker automatically resets. —
No current to cab
Battery disconnect switch is
OFF
Turn battery disconnect switch ON.
Battery Main
Disconnect Switch,
page 328
169883
393
Revision A