Intake Air Heater Contactor
The intake air heater contactor is used on the Ground-
smaster5900and5910toprovide currentfortheengine
intake air heater. The contactor is attached to a frame
bracket behind the batteries (Fig. 87). The contactor is
energized by the engine ECM when low temperatures
are detected prior to starting the engine.
2
2
Testing
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
0.5
ohms or less) that is due to the internal resistance of
the meter and test leads. Subtract this value from the
measured value of the component you are testing.
Figure 87
1.
Air heater contactor
2.
Mega fuse holder
1.
Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch. Raise and support hood to
access intake air heater solenoid.
1
2.
(see Battery Service in the Service and Repairs section
of this chapter).
Disconnect battery cables from battery terminals
2
3.
contactor for assembly purposes. Disconnect all har-
ness electrical connectors from contactor.
Locate contactor. Note wire connector locations on
3
3
4.
Usingjumperwires,apply12VDCdirectlyacrossthe
contactorcoilposts(Fig.88).Thecontactorshouldclick.
With the contactor coil energized, resistance across the
contactor main posts should be less than 1 ohm.
2
Figure 88
3.
5.
Remove voltage from contactor coil posts. The con-
1.
2.
Contactor
Main post
Coil posts
tactorshouldclick.Withthecontactorcoilnotenergized,
resistance across the contactor main posts should be
infinite ohms.
6.
With voltage removed from all contactor posts, mea-
sureresistance across thecontactor coilposts (Fig.88).
Resistance of the coil should be approximately 13.5
ohms.
7.
With voltage removed from all contactor posts, mea-
sure resistance across the contactor main posts (Fig.
Resistance should be infinite ohms.
88).
8.
If testing determines that contactor is faulty, replace
contactor.
9.
After testing, connect harness connectors to contac-
tor.
10.Connect
batterycablestobatteryterminals(seeBat-
tery Service in the Service and Repairs section of this
chapter).
Electrical System
Page 5 -- 48
Groundsmaster 5900/5910
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