o d y l e c t r i c a l oran Warning ight onitor The oran onitor is a current sensing device. If current is flowing through one of the bus lamp circuits, the monitor senses it and illuminates the corresponding monitor light emitting diode (). When a lamp burns out, current flow through the circuit stops and the corresponding on the monitor does not illuminate, indicating the outside lamp is not functioning. The oran onitor is located in the bulkhead over the windshield and slightly to the left of the driver. Warning lights are such an essential safety feature, it is important to know when they are not working properly. This is the function of the oran monitor. Its display is a schematic of the lights as they appear outside the bus. It continuously monitors the current in each lamp. If current is flowing through a particular bus lamp circuit (i.e., the light is on), the monitor senses this and lights the corresponding monitor bulb. If the bus lamp burns out, current ceases and the corresponding monitor bulb goes out, indicating a fault. Once the defective lamp is replaced, and the warning lights are working normally again, this also should be shown by the monitor. The oran monitor is a reliable, long-life device, but as with most electrical instruments, it can be overheated and damaged if an overload occurs in a bus light. Such overloads can exist if a bus light circuit becomes shorted, forcing current through a coil in the monitor that exceeds the coil s rated capacity. Short circuits can occur if improper connections are made during installations, bus repairs, etc. If the monitor has an optional thermistor overload protection, the tail light circuits are overload-protected. (Thermistors are located on the bottom of the component side of the printed circuit board.) Your bus may be equipped with optional tail lights. To monitor these lights a oran U-00 monitor may have been installed. This monitor can be identified by a green power light on the face of the monitor. omplete instructions on set-up, operation and servicing can be found in the Tech Reference. oran Troubleshooting [aution] o not attempt to check a light emitting diode () with an ohmmeter. Some digital voltmeters (V) have a diode checking position, which is acceptable for testing s. ny repair of the oran Warning ight onitor should be referred to a qualified technician. If the oran Warning ight onitor does not display any indicator s: n overload situation may have created an open circuit: heck the system fuses. n overload ( due to addition of extra lights or other loads to the circuit) or physical damage may have burned or broken a conductor on the printed circuit board: Remove the extra load and replace the damaged printed circuit board. xcessive vibration or abuse has resulted in a damaged monitor. Replace the printed circuit board.
s e r v i c e m a n u a l If a particular on the oran Warning ight onitor does not display, but the bus running lights are operating properly: The coil is burned due to an overload. Replace the coil kit. solder joint has weakened (a cold solder joint). low new solder on the connection. The reed switch has failed, the reed has broken, or the contacts have failed. Replace the reed switch kit. The printed circuit board is broken or burned. Replace the printed circuit board. There is an open in the circuit. Replace the. If a monitor indicator is on, but the bus running light indicated is not operating, or the bus running light switch is in the off position and the monitor indicates the running lights are operating: Replace the coil and reed switch kit. If neither the bus running lights nor the oran Warning ight onitor operates properly: The running light bulb may be burned out. Replace the light bulb. The overload thermistor has protected the circuit from overload. Remove the overload condition (a short; incorrect light bulb(s); xtra lights, etc.) (i.e., trailer lights, etc.)
b o d y e l e c t r i c a l ody Wiring Schematics any customer selected options which affect wiring are available for the ll merican. or your convenince when you are limited to the print version of this manual, the following pages contain the standard equipment wiring diagrams representative of circuits common to most ll merican bodies. owever, the Tech Reference contains a much more comprehensive set of schematics which includes many additional diagrams pertaining to specific equipment installations. When using the, click the lectrical Schematics ody link in the ookmarks pane. The first page of the ody lectrical Schematics group contains instructions on how to use the linking and navigation features. The drawings on the are in resolution-independent vector format. This allows you to zoom them at will, without the images becomming jagged as occurs with bitmap formats. This also means that you may print the drawing to your own office or desktop printer while maintaining legibility even at significant reductions.
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