Diode Assemblies
ThediodesD1,D2,andD4providelogicfortheinterlock
switches. Diode D3 is used for circuit protection from in-
ductivevoltagespikeswhentheinterlockrelayisde--en-
ergized. Two types of diodes have been used on the
Groundsmaster 3500--D:
2
3
1.
cated within the main wiring harness that lies under the
hydraulic tank and control console (Fig. 13).
On early production machines, the diodes are lo-
4
1
2.
thewiringharness(Fig.14).Locationofthediodesisun-
der the control console.
Later production machines use diodes that plug into
Figure 13
3.
4.
1.
2.
Diode
Male terminal blade
Female terminal blade
Clear PVC tubing
NOTE: Machines equipped with the standard control
module (serial numbers above 240000000) use only
one diode.
2
Testing
The diodes can be individually tested using a digital
multimeter (diode test or ohms setting) and the tables
below.
3
1.
Diodes located within the main harness (Fig. 13):
1
Multimeter
Red Lead (+)
on
Multimeter
Black Lead (--)
on
Figure 14
3.
Continuity
1.
2.
Diode
Male terminal
Female terminal
Terminal Blade Terminal Blade
Male
Female
Male
YES
NO
Female
2.
Plug--in style diodes (Fig. 14):
Multimeter
Red Lead (+)
on Terminal
Multimeter
Black Lead (--)
on Terminal
Continuity
Female
Male
Male
YES
NO
Female
Electrical System (Rev. D)
Page 5 -- 12
Groundsmaster 3500--D
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