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D R I V E R O R I E N T A T I O N
D R I V E R O R I E N T A T I O N
Doran Warning Light Monitor
The Doran Monitor™ 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 (LED). When a lamp burns out, current flow through the circuit stops and
the corresponding LED on the monitor does not illuminate, indicating the outside lamp
is not functioning. The Doran™ Monitor 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 Doran 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 Doran monitor is a reliable, long-life device, but as with most electrical instru-
ments, it can be overheated and damaged if an overload occurs in a bus light. Such over-
loads 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.)
If the Doran monitor is not working properly, notify your service personnel or see troubleshooting and calibration procedures in your
Blue Bird Service Manual.
Calibration Button
Universal Monitor Only
Green LED
Universal Monitor Only
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