Start Relay - Toro Reelmaster 3550-D Preliminary Service Manual

Start Relay

The start relay is secured to the control panel assembly
next to the operator seat (Fig. 28). This relay is attached
to the wire harness with a five (5) wire connector (Fig.
29). The relay can be accessed by removing the control
panel cover.
The start relay is used to provide current to the engine
starter motor when the relay is energized by the TEC
controller. The TEC controls and monitors the operation
of the start relay.
Testing
1. Park machine on a level surface, lower cutting units,
stop engine, engage parking brake and remove key
from the ignition switch.
2. To make sure that machine operation does not occur
unexpectedly, disconnect negative (--) cable from bat-
tery and then disconnect positive (+) cable from battery
(see Battery Service in the Service and Repairs section
of this chapter).
3. Remove cover from control panel and locate relay
that is to be tested.
4. Disconnect wire harness connector from relay. Re-
move relay from control panel for 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 from the measured value of the component you
are testing.
5. Using a multimeter, verify that coil resistance be-
tween terminals 85 and 86 is from 71 to 88 ohms.
6. 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 make and break
continuity between terminals 30 and 87 as +12 VDC is
applied and removed from terminal 85.
7. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
8. Connect multimeter (ohms setting) leads to relay ter-
minals 30 and 87A. Apply +12 VDC to terminal 85. The
relay should make and break continuity between termi-
nals 30 and 87A as +12 VDC is applied and removed
from terminal 85.
Reelmaster 3550--D
9. Disconnect voltage and multimeter test leads from
the relay terminals.
10.After testing is completed, secure relay to mounting
bracket and connect wire harness connector to relay.
Install cover to control panel.
11. Connect positive (+) cable to battery and then con-
nect negative (--) cable to battery (see Battery Service
in the Service and Repairs section of this chapter).
1
1. Lock nut
2. Start relay
3. Main power relay
1. Coil terminal
2. Common terminal
Page 5 - - 23
6
2
Figure 28
4. Glow relay
5. Screw
6. Control panel
3
1
86 87A 87
85 30
1
2
Figure 29
3. Normally closed term.
4. Normally open terminal
Electrical System
4
5
3
4