Simplicity AGCO Allis 500 Series, Service And Repair Manual

Page: 86 / 201

7 Electrical System Service
Component Tests - Check Wires / Check Ground
7 - 22
COMPONENT TESTS
The following tests should be used in conjunction with
the this section’s troubleshooting flow chart to efficiently
troubleshoot common electrical problems; however, if a
specific component is suspect, these tests can be used
independently of the flow chart and each other.
Figure 9. Testing Cable Continuity
Figure 8. Typical Wire Harness
WARNING
Before beginning any test,
ALWAYS:
• Disconnect the spark plug wire.
• Block the wheels.
IN MOST CASES:
• Engage the parking brake.
• Turn the PTO switch OFF.
• Turn the key switch OFF.
• Place the ground speed control lever in
NEUTRAL (Peerless models only).
If a test procedure requires a configuration other
than the one listed above, instructions will be
provided in that specific procedure.
Always reset the tractor to the configuration list-
ed above unless told otherwise.
A. Check / Clean Wires and Connectors
1. Check all wires for cracked or worn insulation.
2. Check all connectors, terminals, and receptacles for
loose wires or corrosion (Figure 8). Refer to the
exploded view diagrams for wire harness locations.
B. Check / Clean Ground Cable
1. Disconnect the negative battery cable (See DISCON-
NECTING THE BATTERY CABLES, Section 6).
2. Disconnect the other end of the negative battery
cable (ground cable) from the engine.
Briggs & Stratton Models:
The ground cable is attached to the right, rear engine
mounting bolt.
Kohler Models:
The ground cable is bolted to the back of the left side
of the engine block.
3. Clean the battery and cable terminals with a wire
brush until the metal is shiny.
4. Using a VOM set to Ohms, test the continuity of the
cable (Figure 9). The VOM should register no more
than 2-3 Ohms.
5. Clean the negative battery post and engine ground
with a wire brush until the metal is shiny.
6. Reattach the negative cable to the engine block and
then the negative battery terminal.
Check for
Loose Wires
Inspect
Insulation
Check for
Corrosion