Toro Reelmaster 3550-D Service Manual page 210

NOTE: Prior to taking small resistance readings
with a digital multimeter, short the meter test leads to-
gether. The meter will display a small resistance val-
ue (usually 0.5 ohms or less). This resistance is due
to the internal resistance of the meter and test leads.
Subtract this value from from the measured value of
the component you are testing.
C. Using a multimeter, verify that coil resistance be-
tween terminals 85 and 86 is from 71 to 88 ohms.
D. Connect multimeter (ohms setting) leads to relay
terminals 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.
E. Disconnect voltage from terminal 85 and multi-
meter lead from terminal 87.
Electrical System
F. Connect multimeter (ohms setting) leads to relay
terminals 30 and 87A. Apply +12 VDC to terminal 85.
The relay should make and break continuity between
terminals 30 and 87A as +12 VDC is applied and re-
moved from terminal 85.
G. Disconnect voltage and multimeter test leads
from the relay terminals.
5. After testing is completed, secure relay to mounting
panel and connect wire harness connector to relay.
Install cover to control panel.
6. Connect positive (+) cable to battery and then con-
nect negative (−) cable to battery (see Battery Service
in this chapter).
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