BMW F10 M5 F12 M6 Ignition Engine Wiring Harness Ignition Module Cyl.5-8 7843326

BMW F10 M5 F12 M6 Ignition Engine Wiring Harness Ignition Module Cyl.5-8 is an original component from the Cables, harnesses, and connectors group, designed for the ignition system of gasoline engines in BMW sports models. Engineered for specific power units, the harness ensures a stable electrical connection between the ignition module and cylinders 5–8, which translates into reliable engine performance under high loads.

Specifications and technical data

• SKU: 7843326
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7843326
• Substitutable numbers: 7843326, 12517843326, 7852146, 12517852146
• Fuel type: Petrol
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the ignition system

This ignition module harness is responsible for the precise transmission of control signals to the ignition coils serving cylinders 5–8 in the gasoline engine. Proper electrical communication in this area is crucial for:

• stable ignition of the air-fuel mixture at high RPM,
• smooth operation of the power unit under heavy load,
• reducing misfires and associated diagnostic errors,
• maintaining proper exhaust emission parameters.

Thanks to its factory fitment for the specific BMW ignition system, the harness maintains the correct wire routing geometry and appropriate temperature resistance within the engine bay.

Construction, connectors, and compatibility

The harness belongs to the Cables, harnesses, and connectors group, meaning it has been constructed for durable and repeatable electrical contact in a demanding operating environment. The connectors used are factory-matched to the ignition module and engine auxiliary components, facilitating installation without the need for system modifications.

The original BMW solution ensures:

• appropriate length and routing of wires relative to the cylinder head and engine covers,
• proper protection against abrasion and vibrations,
• compatibility with factory brackets and mounts in the engine bay.

As a result, the harness can be integrated into the existing installation in an orderly manner, in accordance with the vehicle manufacturer's specifications.

Benefits of using an original BMW harness

Using an original ignition module harness in BMW sports models translates into a number of practical service and operational benefits:

• Stable engine operation – proper power supply and control of cylinders 5–8 reduces the risk of ignition interference.
• Consistency with the factory installation – no need for wire or connector adaptation, which reduces the risk of installation errors.
• Easier diagnostics – maintaining the original installation architecture facilitates work with factory diagrams and diagnostic tools.
• Safe operation at high temperatures – design intended for installation in the immediate vicinity of the power unit.

This solution is particularly recommended for service work on vehicles driven dynamically, where the ignition system is exposed to intense thermal and electrical loads.

Component condition and service application

The offered harness is a used part, making it an attractive cost-effective alternative while maintaining the manufacturer's original specifications. It is suitable both for standard replacement of damaged wiring and for more extensive service work on the power unit.

In workshop practice, this type of harness is used, among other things, for:

• troubleshooting issues related to misfires on higher cylinders,
• repairs following localized damage to the installation in the engine bay,
• restoring the factory configuration after previous, unprofessional modifications to the installation.

Technical support and additional materials

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as additional harnesses, signal cables, or service connectors, check out the available parts in the BMW Cables, harnesses, and connectors category.

For users preparing their car for the winter season, a guide describing which used components are worth checking and potentially replacing before temperatures drop may be helpful – you can find it in the article Winter essentials: which used car parts are worth checking and replacing before the frost?.