Toro Z Master Z597 Service Manual page 133

ELECTRICAL
How It Works
12 VDC is applied to the audible alarm when the ignition
key is on. For pulse and continuous tone a ground is
needed to activate the audible alarm.
For pulse tone (alternator not charging) the alternator
senses battery voltage dropping and grounds the
alternator relay. The alternator relay activates and
grounds the audible alarm to pulse tone.
For pulse tone (low oil pressure) the oil pressure switch
is closed when the engine is not running. Oil pressure
opens the switch contacts taking the wire to the switch
off of ground. When the oil pressure drops, the contacts
in the switch close and grounds the audible alarm to
pulse tone.
For continuous tone the engine temperature switch
connects to ground when the engine reaches a certain
temperature. The audible alarm has a continuous tone
(Fig. 363).
6
6-12
Fig 363 DSC-2538
Testing
Connect a positive leadfrom a 12 volt battery to the
+ terminal on the back of the audible alarm. Connect
the negative lead to the S terminal on the back of the
audible alarm. You should have a continuous tone. Move
the negative lead to the P terminal of the audible alarm
and you should get a pulse tone (Fig. 364).
Fig 364
Z Master 597 Diesel Series Service Manual
DSC-2539