Toro Groundmaster 31900, Service Manual

Page: 231 / 355

Fan Speed Switch (Model 31903 and 31909)
POSITION CLOSED
CIRCUITS
OFF NONE
LOW B + C + L
MED B + C + M
HIGH B + C + H
The fan speed switch is located in the cab headliner. The switch is used to select
the fan speed (off, low, medium, or high). The fan speed switch receives power
from fuse F−2 (40 Amp) in the cab fuse block.
Testing the Fan Speed Switch
1. Park the machine on a level surface, lower the cutting unit (or attachment),
engage the parking brake, set the key switch to the O
FF
position and remove
the key from the key switch.
2. Disconnect the battery negative (-) cable at the battery; refer to Removing
and Installing the Battery (page 6–64) .
3. Remove the roof from the cab.
4. Disconnect the wire harness connector from the switch and remove the
switch from the control panel if necessary. Check the switch and the harness
connector for damage or corrosion and clean or repair if necessary.
5. Use a multimeter (ohms setting) and the preceding table to determine
whether continuity exists between the various terminals for each switch
position.
6. Replace the switch if necessary.
7. If the switch tests correctly and a circuit problem still exists, check the wire
harnesses; refer to Appendix A (page A–1) .
8. Install the switch, connect the wire harness, inspect and repair the roof seals
if necessary, and install the roof after testing.
9. Connect the battery negative (-) cable at the battery.
Groundsmaster ® 3200, 3300 and 3310 Page 6–39 Electrical System: Testing the Electrical Components
19240SL Rev A