Section C. ELECTRICAL SYSTEMS
40. General
The electrical complex of the hot oil heater consists of two separate electrical systems The clearance, stop, and taillights
normally are operated only when the unit is joined to a tractor or other hauling vehicle for traveling and operate from the
towing vehicle's electrical generating system. The hot oil heater electrical components are energized by an external power
source of much higher electrical rating Lights require a 12 or 24 volt power supply, whereas heater requirements are: 3
phase/60 Hertz/230 volts
NOT : Nose box will reduce 24 volts to 12 volts If towing vehicle has a 24 volt system
WARNING : DO NOT PERFORM MAINTENANCE OR SERVICE TO THE HOT OIL HEATER'S ELECTRICAL SYSTEM
UNTIL THE EXTERNAL ELECTRICAL POWER SERVICE CABLE HAS BEEN DISCONNECTED
41. Wiring and Conduits
a.
General. Inspect the wiring for defective insulation. Pay particular attention to locations where wires pass over
metal edges. Wrap slight insulation deterioration with an approved electrical tape. Refer to the trailer wiring diagram and
the hot oil heater wiring diagram (Fig 4 and 5) when repairing or replacing wires. Tag each wire and corresponding
terminal before removal to insure correct reassembly of the wire to the proper terminal
b.
Testing. To test wires for continuity, disconnect each end of the wire from the component to which it is attached.
Touch probes of a test instrument to each end of the wire disconnected If the test does not indicate continuity, replace the
wire. Test for Improper ground by placing a test probe to one end of the wire and the other probe to the frame of the hot oil
heater If the test instrument indicates a ground where no ground should be indicated, repair or replace the wire.
c.
Cleaning, Inspection, and Repair.
1.
Clean all parts with an approved cleaning solvent and dry thoroughly
2.
Inspect for signs of wear and other damage Replace a defective part
42. Marker, Stop and Tail, Clearance, Identification, Lamps and Reflectors.
a.
General. The marker, clearance, and identification, including the lamps, are the same with the different color
lenses.
b.
Removal. Refer to Fig. 26 and remove 4 mounting screws, nuts and washers (Items 2, 8 & 7). Unplug electrical
connection.
c.
Cleaning and Inspection.
1.
Clean all parts with an approved cleaning solvent and dry thoroughly.
2.
Inspect the reflectors for condition of the reflecting surface and other damage.
56
