Start, Engine Shutdown, Seat, Alarm, PTO, PTO Overtemp, Down Latching and Over Temperature Relays
These eight (8) relays are located under the console housing cover (Fig. 30). The wiring harness is tagged to identify each relay.
Testing
1.Make sure that ignition switch is OFF.
2.Locate relay and disconnect the machine wire har- ness connector from the relay. Remove relay from ma- chine if necessary.
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
0.5ohms or less). This resistance is due to the internal resistance of the meter and test leads. Subtract this val- ue from the measured value of the component you are testing.
3.Using a multimeter (ohms setting), measure coil re- sistance between terminals 85 and 86 (Fig. 31). Resist- ance should be between 70 and 90 ohms.
4.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 have continuity be- tween terminals 30 and 87 as +12 VDC is applied to ter- minal 85. The relay should not have continuity between terminals 30 and 87 as +12 VDC is removed from termi- nal 85.
5.Disconnect voltage and multimeter leads from the relay terminals.
6.Connect multimeter (ohms setting) leads to relay ter- minals 30 and 87A. Ground terminal 86 and apply +12 VDC to terminal 85. The relay should not have continuity between terminals 30 and 87A as +12 VDC is applied to terminal 85. The relay should have continuity between terminals 30 and 87A as +12 VDC is removed from ter- minal 85.
7.Disconnect voltage and multimeter leads from the relay terminals.
8.Secure relay to machine if removed. Connect ma- chine wire harness connector to relay.
1
2
2
| Figure 30 |
1. Control panel | 2. Relay location |
86 87A 87
85 30
Figure 31
Electrical System
Groundsmaster | Page 5 | Electrical System |
