Start Relay
The start relay is used in the engine starting circuit.
When energized by the TEC controller, the start relay
provides a current path to energize the engine starter
solenoid. The start relay is attached to a frame bracket
under the hood next to the hydraulic pump drive shaft
(Fig. 34).
6. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
7.
Connectmultimeter (ohmssetting) leadstorelayter-
minals 30 and 87A. With terminal 86 grounded, apply
VDC to terminal 85. The relay terminals 30 and 87A
+12
should not have continuity as +12 VDC is applied to ter-
minal 85. The relay terminals 30 and 87A should have
continuity as +12 VDC is removed from terminal 85.
The TEC controller controls and monitors the operation
of the start relay. The relay and its circuit wiring should
be tested as a controller output with the Diagnostic Dis-
play before disconnecting and testing the relay (see
DiagnosticDisplayintheTroubleshootingsectionofthis
chapter). If the controller has detected a malfunction in
the start relay circuit, the Diagnostic light can be used to
identify the fault (see Diagnostic Light in the Trouble-
shooting section of this chapter).
8.
multimeterleads fromtherelayterminals. Replacerelay
if necessary.
When testing is completed, disconnect voltage and
9.
Secure relay to machine and connect machine wire
harness connector to relay.
10.Lower
and secure hood.
Testing
1.
Before disconnecting the start relay for testing, test
relayanditscircuitwiringasaTECcontrolleroutputwith
the Diagnostic Display (see Diagnostic Display in the
Troubleshooting section of this chapter). If the Diagnos-
tic Display verifies that the relay and circuit wiring are
functioning correctly, no further relay testing is neces-
sary.
1
2
2.
If the Diagnostic Display determines that start relay
and circuit wiring are not functioning correctly, park ma-
chine on a level surface, lower cutting decks, stop en-
gine, apply parking brake and remove key from ignition
switch. Open hood to gain access to relay.
Figure 34
3.
Locate start relay and disconnect the machine wire
1.
Pump drive shaft
2.
Start relay
harness connector from the relay. Remove relay from
machine for easier testing.
3
4
1
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
86
87A
87
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.
85
30
4.
sistance between terminals 85 and 86 (Fig. 35). Resist-
ance should be between 70 and 90 ohms.
Using a multimeter (ohms setting), measure coil re-
1
2
Figure 35
5.
Connectmultimeter (ohmssetting) leadstorelayter-
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay terminals 30 and 87
shouldhavecontinuityas+12VDCisappliedtoterminal
1.
2.
Coil terminal
Common terminal
3.
4.
Normally closed term.
Normally open term.
85.
The relay terminals 30 and 87 should not have conti-
nuity as +12 VDC is removed from terminal 85.
Electrical System
Page 5 -- 32
Groundsmaster 4300--D
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