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TABLE OF CONTENTS
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
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