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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.
PROBLEM
NO LIGHTS
LIGHTS FLICKERING
LIGHTS DIM
LIGHTS BRIGHT AND BURN OUT
FUSE BLOW-OUT OR CIRCUIT
BREAKER TRIPPING
LAMP BULB BURN OUT
NEW BULB DOESN'T WORK
TABLE OF CONTENTS
Troubleshooting Guide
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
PROBABLE CAUSE
Fuse blown
Connection at plug-in
Broken or corroded wires
Ground wire loose
Wires shorted or loose
Grounding through fifth wheel
Voltage difference between semitrailer
and tractor
Grounding through fifth wheel
Voltage difference between semitrailer
and tractor
Vibration
Short circuit
Vibration
Short circuit
Loose connection
Intermittent short
Improper voltage
Wires switch
Chapter 5
"Electrical System" on page
SOLUTION
Replace fuse
Tighten connection
Replace wire
Clean and tighten ground
Locate, insulate, replace, or tighten
Locate broken ground wire (tractor or
semitrailer)
Match bulbs with tractor voltage
Locate broken ground wire (tractor or
semitrailer)
Match bulbs with tractor voltage
Locate source of vibration and repair
Replace fuse and try all accessories. If
fuse blows right away, locate short
and repair
Locate source of vibration and repair
Replace fuse and try all accessories. If
fuse blows right away, locate short
and repair
Check lamp sockets and ground
connections
Locate short and repair
Check voltage regulator output
Switch power and ground wires at light
4-7.
5-1
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