Chapter 3 — Troubleshooting
PB50 and PW50 Forklift Power Supply Installation Guide 29
Inspecting Cables and Connections
Visually inspect all cable connectors and connections to the
forklift power source. Correct any obvious faults. Use your hands
to wiggle cable connectors to ensure they are not loose or
disconnected. Again, correct any faults before proceeding.
Make sure cables are dressed to go around sharp edges, through
holes without burrs, and do not run unprotected around the lift.
The sheath of the power cable adds protection from accidental
nicks and cuts. Additional sheathing may be beneficial to protect
the cables in highly vulnerable locations.
Inspecting the Fuse
Open the twist-lock fuse holder and remove the fuse for a
continuity test. If you substitute a new fuse and it fails (blows),
the most likely cause is:
• a shorted or miswired input cable.
• faulty or (incorrect) power supply.
Checking the Electrical Measurements
You can measure the voltage or test for continuity to troubleshoot
the battery cable.
Measuring the Voltage
Connector pinout information is provided to allow you to
measure voltage at the input power cable connector and at either
end of the power output cable.
Performing Continuity Testing
Thorough continuity testing takes longer than either substitution
or taking voltage measurements. An ohmmeter is sufficient to
diagnose simple opens or shorts.
Caution: Cables must be disconnected at both ends
before you conduct any continuity tests. Failure to
disconnect cables completely may result in damage
or destruction of your test equipment, or incorrect/
misleading readings.
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