9
Power / SetUp
This condition can produce an open circuit Voltmeter indication of satisfactory Voltage, because the
resistance of degraded continuity is difficult to detect in an open circuit. Degraded circuit/wire/
ground connections can often be detected by detecting the difference in Voltage at the load when
OFF and when ON. Resistance of degraded connections will prevent full Voltage when the circuit
load (Indicator) is ON.
If possible, turn the Indicator ON and OFF while monitoring the primary power Voltage. Be alert
for a significant drop in Voltage when the system is turned ON.
For example if the open circuit Voltage is 11.5 and drops to 10 V or 9.5 V etc. when the indicator is
turned ON, this change is an indication that the system battery may need to be charged or that
continuity of the conductors and connections between the battery to the indicator may have been
degraded by corrosion or loosening, etc.
4. During testing, move the Indicator in its bracket while monitoring the Primary Voltage.
The Indicator should not turn OFF. Watch for any disturbance in the display (if the Power problem is
intermittent).
Voltage readings and Indicator Display should show no aberrations, flicker, etc.
If movement of the Indicator affects the Primary Power, test each power connection.
If Primary Power is delivered via a plug at the side of the Indicator, check that the plug is the correct
size to fit the barrel and also the center pin. Install the correct size plug, if this connection is
physically sloppy or electrically intermittent.
If power is hard-wired to the internal Euro connections of the rear panel, remove the rear cover and
check the internal power wiring for connection and continuity.
The Euro connections are spring-loaded with an internal knife-edge. The insulation of the wires
inserted in these terminals should have the insulation trimmed back to expose at least 3/8 inch or
10mm of bare wire.
The bare wire strands would be twisted so that there are no "flying" strands and so that the twisted
wire may be inserted smoothly into the Euro connector block connection.
Depress the loading tab, insert the twisted wire, release the loading tab. Now, give the wire a gentle
tug to seat the internal clamp and assure that the wire does not slip loose.
5. Internal dry cell batteries may be discharged to below minimum Voltage required to operate and will cause
the Indicator to turn Off.
