5-1
Chapter 5
Troubleshooting Guide
Troubleshooting should be performed by a trained and
competent technician. Landoll Corporation is not
responsible for equipment that is improperly maintained.
Contact an authorized Landoll Service center for
servicing.
Electrical
Most electrical system problems show up as a burned out
light or fuse, or inoperative electrical component. Wiring,
grounds, or components may be at fault. Locate the
symptom in this section that best identifies your electrical
problem. Check out each possible problem under that
symptom. If the problem cannot be located, see an
automotive electrical specialist. For maintenance
procedures see
“Electrical System” on page 4-7.
PROBLEM
PROBABLE CAUSE
SOLUTION
NO LIGHTS
Fuse blown
Replace fuse.
Connection at plug-in
Tighten connection.
Broken or corroded wires
Replace wire.
Ground wire loose
Clean and tighten ground.
LIGHTS FLICKERING
Wires shorted or loose
Locate, insulate, replace, or tighten
Grounding through fifth wheel
Locate broken ground wire (tractor or
semitrailer).
LIGHTS DIM
Voltage difference between semitrailer and
tractor
Match bulbs with tractor voltage.
Grounding through fifth wheel
Locate broken ground wire (tractor or
semitrailer).
LIGHTS BRIGHT AND BURN OUT
Voltage difference between semitrailer and
tractor
Match bulbs with tractor voltage.
FUSE BLOW-OUT OR CIRCUIT
BREAKER TRIPPING
Vibration
Locate source of vibration and repair.
Short circuit
Replace fuse and try all accessories. If
fuse blows right away, locate short and
repair.
LAMP BULB BURN OUT
Vibration
Locate source of vibration and repair.
Short circuit
Replace fuse and try all accessories. If
fuse blows right away, locate short and
repair.
Loose connection
Check lamp sockets and ground
connections.
Intermittent short
Locate short and repair.
Improper voltage
Check voltage regulator output.
Ea
st
ern
W
re
cke
r Sa
le
s
In
c
