Elite 1500 Mazda 13B S4/5 CAS with Flying Lead Ignition Terminated Harness Injector Connector: Bosch EV1

Complete Engine Management Solution for FC3S Rotary

The Elite 1500 Terminated Harness for Mazda 13B S4/5 is a comprehensive wiring solution designed to modernize the electronics of the FC3S RX-7 (Series 4 and 5). Rotaries are notoriously sensitive to ignition timing and fueling accuracy; this harness eliminates the 30-year-old factory wiring that often causes hesitation and blown apex seals. It connects directly to the Haltech Elite 1500 ECU and includes a Flying Lead Ignition section, giving you the flexibility to wire in your choice of coils (Stock, LS, or Truck coils) while providing plug-and-play connections for the Crank Angle Sensor (CAS) and injectors.

Engineering Deep-Dive: CAS Signal Integrity

The Mazda CAS is a magnetic reluctor sensor that is prone to noise interference in the factory loom. This Haltech harness uses shielded multi-core cable for the CAS connection, ensuring that the ECU receives a clean, noise-free RPM and Home signal. This is critical for preventing high-RPM timing scatter. The harness also includes a fuse block to protect the circuits and is terminated with Bosch EV1 injector connectors, suitable for stock injectors or popular upgrades like the ID1000 (older style) or Siemens Deka.

Operational Benefits: Flying Lead Ignition Flexibility

The “Flying Lead” ignition configuration is a strategic choice. Since many rotary enthusiasts upgrade to GM LS coils, AEM smart coils, or stick with the stock igniter, a pre-terminated coil plug would limit options. The flying lead provides the triggered outputs and power feeds, allowing the installer to crimp the specific connector needed for their chosen ignition setup. This ensures a custom fit without unused connectors cluttering the engine bay.

Fitment and Application Scope

Suits:

• Mazda RX-7 FC3S (Series 4 and 5 13B).
• Engines using the S4/S5 CAS.
• Injectors: Bosch EV1 Connectors.
• Ignition: Custom (Flying Leads provided).

Technical Specifications

Summary & Includes

The HT-150975 brings modern reliability to the classic 13B. It fixes the CAS signal issues and allows for custom ignition setups.

Includes:

• 1 x Engine Harness with Fuse Block
• 1 x Firewall Grommet
• 1 x Flying Lead Ignition Harness

Note: This harness is ready for a WBC1 CAN Wideband Controller (sold separately).