Relays With Four (4) Terminals - Toro Reelmaster 7000-D Service Manual

Relays with Four (4) Terminals

Your Reelmaster 7000−D uses a number of electrical re-
lays that have four (4) terminals. A tag near the wire har-
ness relay connector can be used to identify each relay.
The main power relay is used to provide current to most
of the fuse protected circuits (operator seat, InfoCenter
display, engine electronic control unit (ECU), power
point and optional electric equipment). The main power
relay is energized when the ignition switch is in the ON
or START position. The main power relay is located in
the power center compartment of the battery box
(Fig. 54).
If the machine is equipped with an operator cab, the cab
power relay provides current to the operator cab electri-
cal components. The cab power relay is energized when
the ignition switch is in the ON or START position. The
cab power relay is located in the power center compart-
ment of the battery box (Fig. 54).
The glow relay is used to provide current to the engine
glow plugs. The glow relay is energized and monitored
by either the engine ECU (Yanmar diesel engines) or the
TEC (Kubota diesel engines). The glow relay is located
on the air cleaner mounting bracket (Fig. 55 and 56).
On machines with Yanmar diesel engines, the start relay
is a four (4) terminal relay. The start relay is used to pro-
vide current to the engine starter motor solenoid. The
start relay is energized and monitored by the engine
ECU. The start relay is located on the air cleaner mount-
ing bracket (Fig. 55).
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 this chapter).
3. Locate relay that is to be tested.
4. Disconnect wire harness connector from relay. Re-
move relay from mounting bracket 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.
Electrical System
1. Operator seat
2. Main power relay
YANMAR DIESEL ENGINE
2
1
1. Air cleaner mount
2. Screw (3)
3. Start relay (4 terminal)
Page 6 − 52
1
2
Figure 54
3. Cab power relay
FRONT
Figure 55
4. Glow relay (4 terminal)
5. EGR relay (5 terminal)
Reelmaster 7000−D
3
3
4
5