Simplicity AGCO Allis 400 Series, Service & Repair Manual

Page: 47 / 136

5 Electrical Troubleshooting
System Isolation / Cranking System Tests
5 - 8
Figure 7. Circuit Breaker Location
A. Circuit Breaker
Figure 6. Isolating the Cranking and Safety System
A. Yellow Connector
ISOLATE CRANKING AND SAFETY
SYSTEMS
1. Disconnect the spark plug wire(s) from the spark
plug(s) to prevent accidental starting.
2. Remove the yellow connector (A, Figure 6) from the
small solenoid post.
3. Connect a jumper lead from the small solenoid post
to good ground.
4. With an operator in the seat, the PTO switch off, the
parking brake engaged, and the ground speed con-
trol lever in the neutral gate, attempt to crank the
engine.
a.) If the starter turns the engine over, proceed to part
4 TESTING THE SAFETY INTERLOCK SYSTEM.
b.) If the starter does not turn the engine over, pro-
ceed to part 3 TESTING THE CRANKING SYSTEM.
5. Remove the jumper and reconnect the black/yellow
and green/black connector to the solenoid.
TESTING THE CRANKING SYSTEM
For the following tests it is assumed that the battery is
fully charged and all connections and wires are good.
A. Test Circuit Breaker
The circuit breaker (A, Figure 7) is connected to the posi-
tive post of the battery through the positive battery cable
connected at one of the large posts of the solenoid.
1. Set the VOM to VDC.
2. With the negative probe, touch ground.
3. Touch the positive probe to one post of the circuit
breaker, and then the other. Both posts should have
close to full battery voltage going to them. If not,
replace the breaker.
4. Set VOM to Ohms.
5. See Figure 8. Probe both circuit breaker terminals. If
the VOM reads 5 Ohms or more, replace the circuit
breaker.
Figure 8. Testing the Circuit Breaker
A
A
❷
❸