Service Manual

Topdresser 1800 & 2500
Page 4 – 6
Electrical System
Fuse
The Topdresser 2500 uses a single 5 amp fuse for circuit
protection. The fuse holder is located in the battery wire
harness (Fig. 5).
Testing
Remove fuse from the fuse holder for testing. Fuse
should have continuity between fuse terminals.
1. Battery wire harness
2. Switch wire harness
3. Trailer wire harness
4. Fuse
Figure 5
100
-
10
1
2
3
4
Diode Assembly
A diode assembly (Fig. 6) is used in the Topdresser 2500
trailer wire harness (see wire harness drawings in Chap-
ter 6 – Foldout Diagrams). The diode is used for circuit
protection from voltage spikes that occur when the hy-
draulic solenoid is de–energized.
NOTE: If the Topdresser 2500 is equipped with the op-
tional brake kit, a second diode assembly will be used
and is located in the brake kit wire harness.
Testing
1. Make sure the trailer wire harness is unplugged from
the battery harness.
2. Locate diode assembly and remove cable tie that se-
cures diode to wire harness.
3. Unplug the diode from the wire harness for testing.
The diode (Fig. 6) can be tested using a digital multime-
ter (diode test or ohms setting) and the table to the right
(Fig. 7).
4. After testing is complete, make sure that diode is fully
installed into harness connector and secured to harness
with cable tie.
5. Connect trailer wire harness to battery harness.
Figure 6
1. Diode
2. Male terminal
3. Female terminal
1
2
3
Multimeter
Red Lead (+)
on Terminal
Multimeter
Black Lead (–)
on Terminal
Continuity
Female Male YES
Male Female NO
Figure 7