Start, Engine Shutdown, Seat, PTO, Alarm, and Over Temperature Relays
These six relays are located under the console housing
cover. The wiring harness is tagged to identify each
relay.
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
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.
1. Verify coil resistance between terminals 85 and 86
with a multimeter (ohms setting):
A. For the Potter & Brumfield relay (#VF4−65F11),
resistance should be from 85 to 95 ohms.
B. For the Hella Electronics relay (#66211), resist-
ance should be from 70 to 80 ohms.
2. Connect multimeter (ohms setting) leads to relay ter-
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. Connect multimeter (ohms setting) leads to relay ter-
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.
5. Disconnect voltage and multimeter leads from the
relay terminals.
Groundsmaster 4000−D
86
87A
85
Page 5 − 15
87
87
87A
86
30
30
Figure 21
Electrical System
85