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
NEW BULB DOESN’T WORK
Wires switch
Switch power and ground wires at light
