Diode Circuit Board (Fig. 44)
The diode circuit board contains four diodes and is lo-
cated under the console housing. Diode D1−A provides
logic for the interlock system. Diodes D1−B (right wing
deck), D1−C (front deck), and D1−D (left wing deck) pro-
vide latching circuits for the PTO relay.
H
G
F
D1−D
D1−A
D1−C
E
Testing
D1−B
D
The diodes can be individually tested using a digital
multimeter (ohms setting) and the table to the right. If
any of the diodes are damaged, the diode circuit board
must be replaced.
C
B
A
CIRCUIT BOARD
DIODE DIAGRAM
Apply dielectric grease to circuit board contacts when-
ever the circuit board is installed into the wire harness.
Figure 44
Red Lead (+)
on
Terminal
Black Lead (−)
on
Terminal
Continuity
H
A
G
B
F
A
H
B
G
C
F
YES
NO
YES
NO
YES
NO
C
E
D
D
E
YES
NO
Electrical System
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Groundsmaster 4100−D
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