Start Relay
The start relay is used in the engine starting circuit.
When energized by the Electronic Control Module
(ECM), the start relay provides a current path to ener-
gize the engine starter solenoid. The start relay is at-
tached to a frame bracket under the hood next to the
hydraulic pump drive shaft (Fig. 40).
6. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
7.
minals 30 and 87A. Apply +12 VDC to terminal 85. The
relay should have continuity between terminals 30 and
Connectmultimeter (ohmssetting) leadstorelayter-
87A
as +12 VDC is applied to terminal 85. The relay
The ECM controls and monitors the operation of the
start relay. The relay and its circuit wiring should be
testedasanECMoutputwiththeDiagnostic Displaybe-
fore disconnecting and testing the relay (see Diagnostic
Display in the Troubleshooting section of this chapter).
If the ECM has detected a malfunction in the start relay
circuit, the Diagnostic light can be used to identify the
fault (see Diagnostic Light in the Troubleshooting sec-
tion of this chapter).
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.Lower
and secure hood.
Testing
1.
Before disconnecting the start relay for testing, test
1
relay and its circuit wiring as an ECM output with the
Diagnostic Display (see Diagnostic Display in the Trou-
bleshooting section of this chapter). If the Diagnostic
Display verifies that the relay and circuit wiring are func-
tioning correctly, no further relay testing is necessary.
2
2.
If the Diagnostic Display determines that start relay
and circuit wiring are not functioning correctly, park ma-
chineonalevelsurface,lowercuttingunits,stopengine,
apply parking brake and remove key from ignition
switch. Open hood to gain access to relay.
Figure 40
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.
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. 41). Resist-
ance should be between 70 and 90 ohms.
Using a multimeter (ohms setting), measure coil re-
Figure 41
5.
Connectmultimeter (ohmssetting) leadstorelayter-
minals 30 and 87. Ground terminal 86 and apply +12
VDCtoterminal85.Therelayshouldhavecontinuitybe-
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.
Reelmaster 5010 Series
Page 5 -- 35
Electrical System
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