TM 5-3805-280-24-1
System Information
TROUBLESHOOTING CIRCUIT MALFUNCTIONS
9015
05
9
voltage is found. Malfunction is between last two
High Resistance Circuit:
points of measurement.
Open Circuit:
1. A high resistance circuit results in slow, dim or no
component operation. High resistance can be
1. An open circuit results in no component operation.
caused by loose, corroded or oily connector
An open circuit can be caused by broken wires,
terminals.
disconnected connector, blown fuse or tripped
2. High resistance can be caused by wire that is too
circuit breaker.
small or has broken strands internally.
2. Troubleshoot an open circuit by replacing the fuse
3. Troubleshoot a high resistance circuit by measuring
or resetting the circuit breaker, then measure
voltage between the switch and load with the switch
voltage between the switch and load with the switch
ON.
ON.
4. If voltage is low, the malfunction is between the
3. If voltage is zero, the malfunction is between the
point of measurement and the battery. Continue
point of measurement and the battery. Continue
measuring voltage toward battery until normal
measuring voltage toward the battery until normal
voltage is found. Malfunction is between last two
voltage is found. Malfunction is between last two
points of measurement.
points of measurement.
5. If voltage is normal, the malfunction is between
point of measurement and circuit ground. Continue
measuring voltage toward circuit ground until low
Continued on next page
CED,TX13067,2 1918DEC971/3
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