Toro Groundsmaster
3500-D - Diode Assemblies

Groundsmaster 3500--DPage 5 -- 12Electrical System (Rev. D)
Diode Assemblies
The diodes D1, D2, and D4 provide logic for the interlock
switches. Diode D3 is used for circuit protection from in-
ductive voltage spikes when the interlock relay is de--en-
ergized. Two types of diodes have been used on the
Groundsmaster 3500--D:
1. On early production machines, the diodes are lo-
cated within the main wiring harness that lies under the
hydraulic tank and control console (Fig. 13).
2. Later production machines use diodes that plug into
the wiring harness (Fig. 14). Location of the diodes is un-
der the control console.
NOTE: Machines equipped with the standard control
module (serial numbers above 240000000) use only
one diode.
Testing
The diodes can be individually tested using a digital
multimeter (diode test or ohms setting) and the tables
below.
1. Diodes located within the main harness (Fig. 13):
Multimeter
Red Lead (+)
on
Terminal Blade
Multimeter
Black Lead (--)
on
Terminal Blade
Continuity
Male Female YES
Female Male NO
2. Plug--in style diodes (Fig. 14):
Multimeter
Red Lead (+)
on Terminal
Multimeter
Black Lead (--)
on Terminal
Continuity
Female Male YES
Male Female NO
Figure 13
3
2
1
4
1. Diode
2. Male terminal blade
3. Female terminal blade
4. Clear PVC tubing
Figure 14
1
1. Diode
2. Male terminal
3. Female terminal
3
2