TEST OR INSPECTION
Turn battery disconnect switch to ON position (WP 0007). Turn Service Drive Lights
On (TM 9-2320-347-10). Put EMERG MASTER switch to ON position (WP 0004). Put
siren control selector switch to WAIL, YELP, and HI-LO, one position at a
time (WP 0004). Check if siren operates.
If siren operates in at least one mode, but not all positions, replace siren
control (WP 0341).
Integrated siren control amplifier will produce a faint audible signal which can be heard at
siren control if siren speaker or wiring leading to speaker fails.
Put siren control selector switch to WAIL, YELP, and HI-LO (WP 0004). Check if siren
output can be heard at siren control.
If siren is heard faintly at siren control, go to Step 11.
Check if siren speaker operates, but with distortion.
If siren operates with distortion, cut main wire harness wires 1052 (brown),
and 1053 (yellow) at siren speaker connector and swap wire connection, if
distortion persists, replace siren speaker (WP 0428).