Multi Pro 1200/1250
Page 5 -- 16
Electrical System
Accessory Solenoid
Theaccessorysolenoidprovidesacurrentsupplytothe
spraysystem,boomactuatorsandoptionalaccessories
(e.g. foam markers). The solenoid is energized when
theignitionkeyswitchisintheRUNposition.Theacces-
sory solenoid is located under the operator seat (Fig.
23).
Testing
1. Park machine on a level surface, stop engine, en-
gage parking brake and remove key from ignition
switch.
2. Disconnect battery cables from battery. Make sure
that negative (--) cable is removed from battery before
positive (+) cable.
3. Raise operator seat and locate accessory solenoid.
Put labels on wires for proper installation after repairs
are completed. Disconnect machine wire harness con-
nectors from solenoid.
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
The meter will display a small resistance value (usually
0.5 ohms or less). This resistance is due to the internal
resistanceof themeter andtestleads.Subtract thisval-
ue from the measured value of the component you are
testing.
4. Apply 12 VDCdirectlyacrossthesolenoid coil posts
(steel). The s olenoid should click as the solenoid coil is
energized. Make sure resistance across the main con-
tact posts (copper) is less than 1 ohm.
5. Remove voltage from solenoid coil posts. The sole-
noid should click as the solenoid coil is de-- energized.
Make sure resistance across the main contact posts is
infinite ohms.
6. With no voltage to any of the solenoid coil posts,
measure resistance of the coil across the solenoid coil
posts (steel). Resistance should be approximately 13.5
ohms.
7. Replace accessory solenoid if necessary.
8. Using labels placed on wires before removal, con-
nect electrical connections to solenoid.
9. Connect battery cables to battery. Make sure that
positive (+) cable is secured to battery before negative
(--) cable is attached to battery.
10.Lower operator seat.
1. Accessory solenoid
2. Lock washer (2 used)
3. Jam nut (2 used)
4. Boot
5. Nut (2 used)
6. Harness connectors
7. Flange nut (2 used)
8. Cap screw (2 used)
Figure 23
1
2
3
4
5
6
7
8
Figure 24
WIRING
DIAGRAM
1. Main posts (copper)
2. Solenoid posts (steel)
1
2
1
1
2
2
2
1
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