Simplicity AGCO Allis 500 Series, Service And Repair Manual

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7 Electrical System Service
Solenoid Tests
Figure 31.Testing for Solenoid Short
Figure 32. Testing Solenoid Continuity
SOLENOID BENCH TEST
Replace a solenoid that does not pass all of the following
tests.
1. Label and remove all wires from the solenoid, then
remove the solenoid from the tractor.
2. Set the VOM to Ohms. Probe the small posts of the
solenoid (Figure 29). The VOM should read less
than 10 Ohms.
3. Connect the VOM probes to the large posts (Figure
30). The meter should read no continuity.
4. See Figure 31. Probe the mounting base of the sole-
noid. Probe one of the small posts and observe the
VOM. Now probe the other small post. The VOM
should read no continuity in both cases.
5. Apply 12 VDC to the two small posts. There should
be an audible click as the solenoid engages.
6. With the solenoid engaged (12 VDC to the small
posts), measure the resistance at the two large posts.
The VOM should read less than 10 ohms (continuity).
Replace a solenoid that does not pass all tests.
Figure 30. Testing Solenoid Short
Figure 29. Testing Solenoid Resistance
+
-
12 VDC