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Repair & Troubleshooting
Forklift Moves Forward but Won't Reverse
A forklift that drives forward but not backward usually has a faulty direction switch, a reverse contactor that isn't pulling in, or a controller input/interlock issue — the reverse signal path is broken somewhere.
— Reviewed by the ForkliftIQ technical team
Forward works, so the battery, drive motor and most of the controller are fine — the fault sits in the small part of the system that is different for reverse: the direction switch, the reverse contactor or the controller's reverse input and its interlocks. Trace the reverse signal from the lever to the contactor in order.
Forward proves the drive — trace the reverse path — indicative diagnostic map, schematic only.
Most likely causes
Faulty direction switch or lever — The reverse side of the direction switch wears or corrodes so the controller never receives the reverse command.
Reverse contactor not engaging — On trucks with directional contactors, a failed coil, burnt tips or a dead driver circuit leaves reverse dead while forward works.
Controller fault or interlock — A stored fault, or an interlock (seat, brake, tilt) that the controller applies only to reverse logic, can block reverse selectively.
Broken wiring in the reverse circuit — A single broken or chafed wire between lever, controller and contactor kills reverse and nothing else.
How to diagnose it
1
Read the controller fault codes first — a logged fault often names the reverse circuit directly.
2
Test the direction switch: confirm the reverse position actually closes its contact and the signal reaches the controller.
3
Listen (and measure) at the reverse contactor when reverse is selected — no click means coil, driver or signal; a click with no drive means burnt tips.
4
Confirm the interlocks (seat, parking brake) are satisfied and not applied selectively to reverse.
5
Check continuity of the reverse wiring between lever, controller and contactor for a single broken conductor.
⚠ Safety: Contactor work is live-circuit work — disconnect the battery before touching tips or coils, and never wedge a contactor closed to force reverse.
The reverse-only parts of the system are at fault: usually the direction switch, the reverse contactor, or the controller's reverse input/interlock. Forward working proves the motor and battery are fine.
How do I test a forklift direction switch?
Check continuity across the reverse contact while operating the lever, then confirm the signal arrives at the controller input. A switch that never closes on reverse is the fault.
What does it mean if the reverse contactor doesn't click?
The coil, its driver circuit or the command signal is dead. If it clicks but the truck still won't move, the contact tips are likely burnt and not conducting.
Can an interlock block only reverse?
Yes — some controllers apply seat, brake or tilt interlocks differently by direction. Read the fault codes and confirm all interlocks are satisfied before replacing parts.
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