Start, Neutral, Seat, Cutting Deck, Parking Brake, and High Temperature Relays
The relays are located under the console cover (Fig.
23).
The wiring harness is tagged to identify each relay.
1
NOTE: Machines
with
serial
numbers
above
230000000
use a standard control module to monitor
3
several switches. These machines do not use a start,
neutral, seat, parking brake or high temperature relay.
4
2
5
6
NOTE: The relays may be manufactured by one of two
different manufacturers. Verify manufacturer name and
part number before performing the resistance check on
the relay coil.
NOTE: Prior to taking small resistance readings with a
digital multi meter, short the meter test leads together.
The meter will display a small resistance value (usually
7
8
9
0.5
ohms or less). This resistance is due to the internal
Figure 23
resistance of the meter and test leads. Subtract this val-
ue from from the measured value of the component you
are testing.
1.
2.
3.
4.
5.
Control panel
K8 relay: seat
K9 relay: neutral (behind)
K7 relay: parking brake
K3 relay: GM4700 deck 7
6.
7.
8.
9.
K2 relay: decks 1 -- 5
K6 relay: high temp
K5 relay: start
K1 relay: GM4700 deck 6
1.
Verify coil resistance between terminals 85 and 86
with a multimeter (ohms setting):
86
85
87A
87
A. For the Tyco Electronics relay (#VF4--65F11), re-
sistance should be from 71 to 88 ohms.
87
87A
86
85
B. For the Hella Electronics relay (#66211), resist-
ance should be from 70 to 80 ohms.
30
2.
Connectmultimeter (ohmssetting) leadstorelayter-
30
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.
3.
Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
4.
Connectmultimeter (ohmssetting) leadstorelayter-
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.
Figure 24
5.
Disconnect voltage and multimeter leads from the
relay terminals.
Electrical System (Rev. A)
Page 5 -- 16
Groundsmaster 4500--D/4700--D
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