The wiring loom connects your Logitech pedals to the wheelbase. It includes the cable running between the pedals and wheel, the wiring inside the pedal housing, and the connectors attached to each pedal.

A damaged loom can cause flickering readings, pedals that stop responding, or one pedal affecting another. These symptoms can look very similar to a faulty potentiometer, so identifying which part is responsible is an important first step.

This guide covers the stock wiring used in Logitech G25, G27, G29, G920 and G923 pedal sets.

What does the wiring loom do?

Each pedal has a potentiometer—a sensor that changes its electrical output as you press the pedal. The wiring loom supplies the potentiometers with power and carries their signals back to the wheelbase.

The wheelbase reads those signals and sends the accelerator, brake and clutch positions to your PC or console.

Each potentiometer has three connections:

On the stock loom, orange is the accelerator signal, white is the brake signal and green is the clutch signal.

When a pedal is released, its signal voltage is high. As you press it, the voltage decreases. The wheelbase interprets this changing voltage as pedal position.

The loom therefore needs to do more than maintain a connection. Its wires and terminals must provide stable electrical paths. An intermittent connection or excessive resistance can change the voltage reaching the wheelbase, making the reported pedal position different from what your foot is actually doing.

There is also a black wire connected to the metal pedal chassis. This is separate from the black connection at the potentiometer. When investigating pedal operation, it is the black wire connected to the potentiometer that matters. The chassis connection should still remain securely attached.

How is the stock loom arranged?

Each pedal has its own signal wire, but the red supply and black ground wires are shared.

Inside the stock pedal set, these shared connections are passed from one pedal to the next in a daisy chain. The order is:

Clutch → Brake → Accelerator

The junctions are made at the crimped connectors, where wires are mechanically gripped by the metal terminal.

This arrangement means some connections serve more than one pedal. A break in a shared section can affect several pedals, even though their potentiometers are working correctly.

For example, a break in the shared supply before the clutch can affect all three pedals. A break between the clutch and brake can affect the brake and accelerator while leaving the clutch working.

The exact result depends on which wire or junction has failed. However, several pedals developing a fault together is a good reason to investigate the shared wiring before assuming that several sensors have failed at once.

What are the shortcomings of the stock loom?

Fine wires are vulnerable to physical damage. The stock wiring is sufficient to carry the small electrical currents used by the pedal sensors, but the conductors are very fine. They can be damaged by pulling, crushing, repeated bending or careless handling during maintenance.

The weakness is primarily mechanical: the wires do not need to carry much power, but they still have to survive life on the floor beneath a racing setup.

The daisy-chain connections introduce shared failure points. Because the supply and ground continue through crimped junctions, a poor connection can affect both the local pedal and pedals farther along the chain.

Crimping itself is an established and reliable connection method when the terminal, wire and tooling are correctly matched. The concern is a damaged or deteriorated connection within this particular arrangement, especially where a terminal also joins wires supplying another pedal.

Faults can be difficult to see. The outer insulation may look undamaged even when the conductor inside has broken. A connection can also work in one cable position and fail when the cable moves.

A visual inspection is useful, but an intact-looking cable does not prove that the wiring is sound.

Why does the loom break?

Pedal cables often have a hard life. Common causes of damage include:

• Being pulled when the pedals, wheel or rig are moved.
• Being run over by chair wheels or crushed beneath chair feet.
• Becoming trapped in a folding racing seat.
• Being pinched beneath the pedal housing or against a wall.
• Repeatedly bending sharply at the same point.
• Being chewed by pets.

The point where the cable enters the pedal housing deserves particular attention. Pulling and bending can concentrate stress there, and the cable can become trapped behind or beneath the pedals.

Repeated flexing can fatigue the copper conductors. A damaged conductor may make and break contact as the cable moves, eventually becoming completely disconnected. Damage or deterioration at a terminal can also introduce resistance without producing a clean, obvious break.

Internal wiring can be damaged during repairs or upgrades too. Pulling on a wire to remove a tight spade connector can pull the wire out of its crimp. Grip the metal connector with suitable pliers instead, and avoid straining the potentiometer terminal.

Wires can also be trapped when the bottom cover is refitted. Correct routing and secure cable retention matter with any loom.

What symptoms can damaged wiring cause?

The symptoms depend on which electrical connection is affected.

A disconnected signal can also allow one pedal’s reading to be influenced by another. For example, pressing the accelerator may make the brake reading move.

These are useful clues, rather than a diagnosis on their own. Potentiometer faults can produce overlapping symptoms, and calibration or software can alter how a hardware fault appears on screen.

Can the stock loom be repaired?

Yes. A damaged loom can be repaired if the fault can be located and a sound connection restored.

An isolated break may be repairable by replacing the damaged section and making properly insulated joints. A damaged terminal may be replaced using the correct terminal and crimping tool.

A reliable repair needs to restore both electrical continuity and mechanical strength. Any joint must be insulated, supported and positioned so that it will not be repeatedly bent or trapped when the housing is reassembled.

Simply twisting broken wires together and covering them with tape is unlikely to provide a dependable long-term repair.

The difficult part is often finding the full extent of the damage. A crushed or stretched cable may contain more than one damaged conductor. Repairing the first obvious break can leave another intermittent fault behind.

Should you replace a broken loom?

Repair can make sense when there is one clearly identified fault, the rest of the loom is in good condition, and you have the tools and experience to repair and test it properly.

Replacement is usually the more practical option when damage is extensive, faults are intermittent, several connections are suspect, or you want to avoid repeated repairs.

A complete replacement renews the internal wiring and the external cable together. It removes the uncertainty of repairing one section while retaining the rest of an ageing or damaged loom.

However, confirm that the wiring is responsible before replacing it. A pedal swap test can help distinguish a pedal-unit fault from a wiring fault, while multimeter testing can check the electrical paths more directly. Replacing the loom will not cure a worn or faulty potentiometer.

Why is the AXC SIM loom better than the stock loom?

The AXC SIM loom addresses the stock loom’s main weaknesses through stronger wiring and a different arrangement of the shared connections.

Thicker copper wires

The AXC SIM loom uses thicker conductors than the original loom, making the wiring more robust and less prone to physical breakage.

The benefit is durability. A healthy stock loom already carries the pedal signals correctly; thicker wiring helps maintain a reliable connection through everyday handling and use.

Individual supply and ground wires for each pedal

Each pedal has its own red supply and black ground wires running to common soldered connections. The supply and ground do not depend on passing through another pedal’s connector.

This removes the stock daisy-chain junctions at the pedal terminals. A fault confined to one pedal’s individual supply or ground branch therefore does not interrupt the corresponding connection to the other pedals.

Secure terminals and insulated splices

The AXC SIM loom uses crimp terminals matched to its wire size. Its cable splices are soldered and individually insulated with heat-shrink tubing. These construction details provide secure connections at the terminals and shared junctions. AXC SIM replacement loom specifications

Complete, tested replacement wiring

Every AXC SIM loom is checked and tested before shipping. Once correctly installed, it provides a known-good starting point for the wiring, helping remove uncertainty when investigating an older pedal set.

It replaces the complete wiring assembly, from the pedal connections to the plug at the wheelbase, and installation requires no soldering. AXC SIM replacement wiring loom

The replacement still needs sensible cable routing and protection from crushing or pulling. Its stronger construction improves durability, while its individual pedal connections remove a weakness of the stock daisy-chain arrangement.