5-3 ELECTRICAL
Most electrical system problems show up as a burned out light or fuse, or inoperative electrical compo-
nent. 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 lo-
cated, see an automotive electrical specialist. For maintenance procedures,
see Section 4-5.
SYMPTOM
PROBLEM: REMEDY
NO LIGHTS
Fuse blown on tractor: Replace fuse.
Loose connection at plug-in: Tighten connection.
Dirty or corroded 7-way connector or receptacle: Clean
w/ wire brush or replace connector or receptacle.
Broken or corroded wires: Replace wire.
Ground wire loose: Clean and tighten ground.
LIGHTS FLICKERING
Wires shorted or loose: Locate, insulate, replace, or
tighten.
LIGHTS DIM
Voltage difference between trailer & tractor: Tractor
supply wire or circuit components are too low a capacity. -
Enlarge wire or component. Match bulbs with tractor
voltage.
LIGHTS BRIGHT & BURN OUT
Ground wire disconnected: Connect ground wire.
Voltage difference between trailer & tractor: Tractor
supply wire or circuit components are too low a capacity. -
Enlarge wire or component. 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.
5-4 TIRES - WHEELS - SUSPENSION
Most tire, wheel, and suspension related problems are due to excessive loads, extreme conditions, and
improper maintenance. Tire, wheel, and suspension problems can be easily detected and solved by check-
ing the following guide. For maintenance procedures,
see Sections 4-6, 4-9, 4-10 and 4-11.
SYMPTOM
PROBLEM: REMEDY
VIBRATIONS WHILE DRIVING
Improper tire inflation: Inflate to proper pressure.
Tires cupped or have flat spots: Replace tires.
Wheels bent or loose: Replace or tighten.
Tires incorrectly mounted: Remount.
Mud in wheels: Clean wheels.
Tire(s) out of balance: Balance tires.
Brakes dragging: Locate cause and repair.
Object(s) stuck between duals: Remove object(s).
RAPID TIRE WEAR/DETERIORATION:
CENTER TREAD WEAR
Over inflation: Deflate to correct inflation.
SHOULDER TREAD WEAR - BOTH SHOULDERS
Under inflation: Increase inflation to correct psi. Check
axle alignment.
Overload: Do not load above rated tire capacity.
SHOULDER TREAD WEAR - ONE SHOULDER
Axle damage: Straighten or replace axle.
Axles not parallel: Check axle alignment.
5-3
Summary of Contents for 330A
Page 3: ...MODEL 330A SEMITRAILER OPERATOR S MANUAL PURCHASED FROM DATE ADDRESS PHONE NO SERIAL NO...
Page 8: ......
Page 12: ......
Page 20: ...3 8 Figure 3 3 Steps for Loading and Unloading...
Page 26: ...3 14 Figure 3 7 Rear Impact Guard System...
Page 34: ...4 6 Figure 4 2 330A Wiring Diagram...
Page 35: ...4 7 Figure 4 3 Remote Wiring Diagram...
Page 40: ...4 12 Figure 4 6 Examples of Camber Figure 4 7 Checking Axle for Bend...
Page 44: ...4 16 Figure 4 11 Axle and Brake Assembly...
Page 47: ...4 19 Figure 4 13 Three Spoke Wheel and Drum Figure 4 14 Outboard Mount Hub and Drum...
Page 52: ...4 24 Figure 4 19 Mounting Tires and Wheels Figure 4 20 Stud Tightening Sequence...
Page 54: ......
Page 62: ...NOTES 5 8...