Toro Groundsmaster 3280-D Service Manual page 289

Testing the Relays
Groundsmaster ® 3280-D/3320
05138SL Rev B
g244180
1. Cab power relay
The cab power relay (on the machines with operator cab) is attached near the
battery (Figure 161). The cab power relay is used to provide current to the
operator cab electrical circuits.
1. Park the machine on a level surface, lower the cutting deck, shut off the
engine, set the parking brake, and remove the key from the key switch.
2. To get access to the glow relay, remove the control panel. To get access to
the accessory relay or cab power relay, open the hood.
3. To ensure that the machine operation does not occur unexpectedly,
disconnect the negative (-) cable from the battery and then disconnect the
positive (+) cable from the battery; refer to
4. Locate the relay that is to be tested and disconnect the wire harness
connectors from the relay.
Note: Before taking small resistance readings with a digital multimeter, short
the multimeter test leads together. The meter displays a small resistance
value (usually 0.5 ohms or less). This resistance is because of the internal
resistance of the multimeter and test leads. Subtract this value from the
measured value of the component that you are testing.
Figure 161
2. Battery
Servicing the Battery (page
Page 6–61 Electrical System: Testing the Electrical Components
6–81).