Testing Relays with 4 Terminals (continued)
relay should make and break continuity between terminals 30 and 87 as
+voltage is applied and removed from terminal 85.
8. Replace the relay as necessary.
9. If the relay tests correctly and a circuit problem still exists, check the wire
harnesses; refer to
Appendix A (page A–1)
.
10. Install the relay and connect the wire harness.
11. Connect the battery negative (-) cable at the 12V system battery (model
04580), or connect the 48V battery disconnect (model 04590) before
returning the machine to service.
Testing Relays with 5 Terminals
1. Park the machine on a level surface, lower the cutting units, set the key
switch to the O
FF
position and remove the key.
2. Disconnect the battery negative (-) cable at the 12V system battery (model
04580); refer to
Removing and Installing the 12V System Battery (Model
, or unplug the 48V battery disconnect (model 04590);
refer to
48V Battery Disconnect (page 5–9)
.
3. Remove the right side cover.
4. Disconnect the wire harness connector from the relay being tested. Check
the relay and the harness connector for damage or corrosion and clean or
repair as necessary. Remove the relay from the mounting panel.
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). This resistance is due to the internal resistance of
the meter and test leads. Subtract this value from the measured value for
the tested component.
5. Using a multimeter, verify that coil resistance between terminals 85 and 86 is
from 71 to 88 ohms.
g256780
Figure 86
Relays with 5 terminals
6. Verify infinite resistance (no continuity) exists between terminals 30 and 87.
Greensmaster® eTriFlex 3360 and 3370
Page 5–95
Electrical System: Testing the Electrical Components
19239SL Rev B
