PRELIMINARY – For Toro Distributor
and Toro Company
use only.
ProForce Debris Blower
Page 4
−
14
Electrical System
Fuel, Magneto and Power Relays
The ProForce Debris Blower electrical system includes
three (3) identical relays. The fuel, magneto and power
relays are secured to a frame bracket between the bat-
tery and the engine (Fig. 13). All three relays are ener-
gized by the Remote Control Module. Relays can be
identified by a tag on the wire harness.
The power relay is used to provide power to the machine
when energized by the Remote Control Module.
The fuel relay is used to energize the engine carburetor
fuel solenoid. When the ignition switch is in the RUN or
START position, the fuel relay is energized by the Re-
mote Control Module.
The magneto relay is used to allow ignition operation
when the relay is energized by the Remote Control Mod-
ule. When de
−
energized, the relay provides a grounding
path for the engine ignition armatures to prevent ignition
operation.
Testing
1. Make sure that ignition switch is OFF.
2. To prevent unexpected machine operation, discon-
nect the negative battery cable from the battery termi-
nal. Position disconnected negative cable away from
the negative battery terminal.
3. Locate relay and disconnect the machine wire har-
ness connector from the relay. Remove relay from ma-
chine for easier testing.
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
resistance of the meter and test leads. Subtract this val-
ue from the measured value of the component you are
testing.
4. Using a multimeter (ohms setting), measure coil re-
sistance between terminals 85 and 86 (Fig. 14). Resist-
ance should be between 70 and 90 ohms.
5. Connect multimeter (ohms setting) leads to relay ter-
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should have continuity be-
tween terminals 30 and 87 as +12 VDC is applied to ter-
minal 85. The relay should not have continuity between
terminals 30 and 87 as +12 VDC is removed from termi-
nal 85.
6. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
7. Connect multimeter (ohms setting) leads to relay ter-
minals 30 and 87A. Apply +12 VDC to terminal 85. The
relay should have continuity between terminals 30 and
87A as +12 VDC is applied to terminal 85. The relay
should not have continuity between terminals 30 and
87A as +12 VDC is removed from terminal 85.
8. Disconnect voltage and multimeter leads from the
relay terminals.
9. Secure relay to machine and connect machine wire
harness connector to relay.
10.Connect negative battery cable to negative battery
terminal. Tighten nut that secures battery cable from
10
to 15 ft
−
lb (14 to 20 N
−
m)
. Make sure that battery cover
is secured.
1. Engine
2. Battery
3. Relay
location
Figure 13
1
2
3
Figure 14
86
85
87A
87
30
