ASI BAC Wiring Harness – Sur-Ron Light Bee X / L1E (Plug & Play)

This ASI BAC wiring harness is a plug-and-play loom built for the Sur-Ron Light Bee X and Sur-Ron Light Bee L1E electric motorcycles. It links an ASI BAC4000 or ASI BAC8000 motor controller to the bike’s factory wiring. The harness uses OEM-type connectors throughout, so the swap stays clean and reversible.

Display support is built in as well. You can run either the APT 750C colour display or the Eggrider V2 Bluetooth display through the same loom. No extra adapters or intermediate looms are needed. Because the connector types match the factory Sur-Ron installation, there is no soldering and no wire cutting.

Please note that this listing covers the harness only. The motor controller, the display and the motorcycle itself are sold separately. The harness does not change power or speed on its own. Instead, it gives your ASI BAC controller a tidy, secure connection to the bike.

Key Benefits

• Plug and play connection – the loom attaches straight to the bike’s existing connectors, with no soldering required.
• OEM-type connectors – the plugs match the factory wiring on the Sur-Ron Light Bee.
• ASI BAC4000 compatibility – the wire layout is mapped to this controller’s connector pinout.
• ASI BAC8000 compatibility – the same harness also fits the higher-output BAC8000 controller.
• Dual display support – connect either an APT 750C or an Eggrider V2 display.
• No adapters needed – there are no intermediate looms or conversion plugs to source.
• Quick installation – remove the OEM controller, then fit the ASI BAC in its place.
• Secure contact – latching connectors reduce the chance of a wire working loose while riding.

Who Is This For?

The harness is made for the Sur-Ron Light Bee X and the Sur-Ron Light Bee L1E running factory wiring. The L1E is the road-legal homologated version of the bike. Other models are not covered by this loom.

It suits riders who are replacing the stock controller with an ASI BAC4000 or an ASI BAC8000. These ASI (Accelerated Systems Inc.) units are FOC controllers. Their parameters are adjusted through the BACDoor software, so you keep full control over the tuning.

Alongside the controller, the loom is used with an APT 750C or an Eggrider V2 display. The Eggrider V2 lets you edit controller settings from a Bluetooth phone app. The APT 750C is a wired colour display instead. As a result, the harness works equally well for workshops and for owners handling the controller swap themselves.

Technical Specifications

Installation Steps

• Disconnect the battery before starting any work.
• Remove the OEM controller from the bike.
• Connect the harness to the ASI BAC controller and to the motorcycle connectors.
• Mount the display, either the APT 750C or the Eggrider V2, and join the plugs.
• Check polarity, cable routing and every latch.
• Power the system up and configure the BAC parameters.
• Set wheel diameter, pole count, rotation direction and the limiters.

Why Choose This Harness?

The main difference is simple: no wire cutting and no soldering. Rather than a hand-spliced connection, you get factory-type plugs on both ends. Consequently, the job takes less bench time and the finished installation stays neat.

In addition, a single harness covers both ASI controllers, the BAC4000 and the BAC8000. It also supports two different displays. So if you later move from an APT 750C to an Eggrider V2, the loom stays in place and only the display changes.

Frequently Asked Questions

Is soldering or an adapter needed?

• No, this is a plug-and-play harness.
• OEM-type connectors are used throughout.
• No additional adapters are required.

Will this harness work with the Eggrider V2?

• Yes, the loom is compatible with the Eggrider V2 display.
• The APT 750C display is supported as well.
• Eggrider V2 settings are edited through a Bluetooth phone app.

Does it only fit the Sur-Ron Light Bee X?

• The harness fits both the Sur-Ron Light Bee X and the Light Bee L1E.
• The L1E is the road-legal homologated version.
• Other models are not covered.

Which controllers work with this harness?

• ASI BAC4000.
• ASI BAC8000.
• The controller is not included in the package.

Is a controller or display included?

• No, the listing covers the wiring harness only.
• The controller and the display are bought separately.
• The motorcycle is also sold separately.

How are the ASI BAC settings adjusted?

• BAC parameters are configured through the BACDoor software.
• Wheel diameter, pole count and rotation direction are set there.
• The Eggrider V2 also allows changes over Bluetooth.

Will the harness increase power or speed?

• No, the loom itself does not alter output.
• It provides a tidy connection for the ASI BAC controller.
• Performance depends on the controller and its parameters.

For anyone fitting an ASI BAC controller to a Sur-Ron Light Bee X or L1E, this harness removes the guesswork from the wiring stage. The factory-type plugs keep the loom serviceable, and one part covers both controllers and both supported displays.