Haltech HT-059904 I/O 12 Expander Box A - CAN-Based 12-Channel Kit

Vehicle Fitment

• Universal application - compatible with CAN-enabled Haltech ECUs (Box A configuration)

Features

• Provides 12 additional user-configurable I/O channels via CAN bus
• 4 x AVI analogue voltage inputs (0-5 V) for sensors
• 4 x DPI digital pulsed inputs (0-5 V, up to 300 Hz)
• 4 x DPO digital pulsed outputs (5 V/12 V pull-ups, max 1 A) for actuators or loads
• Channel data broadcast to ECU at ~20 ms per channel for responsive performance
• User-definable "Safe State" for outputs in case of CAN error or communication loss
• Switchable pull-up resistors on analogue channels - ideal for temperature or low-voltage sensors
• Powered via CAN bus - external power only needed if DPO outputs are used
• LED indicators for power and CAN status
• Supports multiple I/O expanders (with unique CAN IDs, e.g. Box A + Box B) for up to 24+ total channels (depending on ECU compatibility)

Specifications

• Physical dimensions: 98 mm (L) x 64 mm (W) x 28 mm (H)
• Weight: 125 g (unit) + ~630 g wiring harness
• Input voltage supply: 8.6 - 16.5 V DC
• Analogue input range: 0-5 V (AVI)
• Digital input: 0-5 V pulses, up to 300 Hz (DPI)
• Digital outputs: 5 V / 12 V pull-up, max 1 A per channel (DPO)
• Includes 2.5 m (8 ft) flying lead harness and 300 mm CAN cable (DTM-4 to 8-pin TYCO) as shipped kit

Included Components

• 1x I/O 12 Expander Box A (HT-059904)
• 1x 2.5 m (8 ft) flying lead harness
• 1x 300 mm CAN connection cable (DTM-4 to 8-pin Black TYCO)
• 1x Quick-Start / Instruction guide

Product Description

The Haltech HT-059904 I/O 12 Expander Box A is a compact, CAN-bus based expansion module designed to significantly increase the input/output capacity of compatible Haltech ECUs. By offering 12 additional configurable channels, this unit enables monitoring of extra sensors (e.g. temperature, pressure, EGT, boost, etc.) and control of additional actuators, fans, pumps or other electrical components - ideal for custom wiring harnesses, race builds, standalone ECU installations, or projects needing greater flexibility than a stock ECU allows.

Installation is simple: connect the Expander to your Haltech ECU via the CAN cable, plug-in the provided harness, and configure channel assignments through the ECU's software. The unit draws power over the CAN network - so no additional power wiring is needed unless you're using the digital outputs - and is delivered with a long flying-lead harness for flexible routing in the engine bay or wiring loom. For builds requiring even more I/O, you can deploy two expanders (Box A + Box B) on supported ECUs for up to 24 extra channels (subject to ECU firmware and CAN-hub configuration).

This module offers tuners, custom-build enthusiasts, and performance/race car builders the flexibility and scalability needed when multiple sensors and actuators are part of the setup. Whether it's a swapped engine, standalone ECU, custom wiring loom, or advanced data-logging setup - the HT-059904 provides reliable, modular expansion in a plug-and-play form.