Geotab HRN-RX06S4 Harness: Fitment, Install and Specs

What Is the HRN-RX06S4?

The HRN-RX06S4 is a 6-way IOX harness that adds IOX expansion support to the GO RUGGED, and Geotab says it is required to install any IOX add-on on that device. It is 100 cm (39 in) long, and its gray connector is the weather-resistant part of the assembly.

IOX modules are Geotab's add-ons for extra inputs, outputs and accessories. On standard GO devices they plug into an expansion port, but the sealed GO RUGGED handles expansion through this dedicated harness instead. On the GO RUGGED, the IOX port connection uses pins 2 through 5 for CAN Low, CAN High, power and ground.

Schematic only: the RX06S4 carries the GO RUGGED's IOX bus to the first add-on module through a weather-resistant gray connector.

Which Vehicles and Devices Does the HRN-RX06S4 Work With?

The device is the GO RUGGED, on any vehicle or machine where it is installed and an auxiliary connection is needed. The harness is independent of the vehicle; what it pairs with is the IOX module. Geotab's GO9 RUGGED page names driver feedback options such as the IOX-BUZZ external buzzer and IOX-GOTALK, which reach the device this way.

Geotab's identification doc lists a maximum connected cable length of 1 m (3.2 ft) for this harness, shorter than the usual 2 m (6.5 ft). It shows China as country of origin, with no superseded part and no separate installation document listed. On power, the GO9 RUGGED page caps the combined current passed to IOX devices in a daisy chain at 2750 mA.

What Problem Does It Solve on the Job?

Equipment fleets often want more than location and engine data. They want to know when a PTO engages, when a boom or blade is in use, or they want an audible alert for the operator. Those features come from IOX modules, and on a GO RUGGED none of them can connect without the RX06S4. Ordering it alongside the device, even when IOX work is planned for a later phase, saves a second trip.

The weather-resistant gray connector also matters on machines that are washed down or parked outside, where an exposed accessory connection would be the first thing to fail.

How Is the HRN-RX06S4 Installed?

Any GO RUGGED work, this harness included, is a professional installation under Geotab's rules. With no part-specific document listed, our technicians follow Geotab's device rules and IOX power budget:

Before starting, list the IOX modules to be fitted and add up their maximum current draw; the total must stay at or under 2750 mA.
With the machine parked and secure, plan the GO RUGGED and IOX locations so the connected run stays within the 1 m (3.2 ft) limit for this harness.
Connect the RX06S4 to the GO RUGGED's IOX connection and plug the gray connector into the first IOX module, keeping that connector whole.
Daisy-chain any further IOX modules according to their own instructions.
Fasten the GO RUGGED, the harness and every IOX module with cable ties, away from moving parts, heat and controls.
Power up, confirm the GO RUGGED's ignition, GPS and cellular LEDs, and check in MyGeotab that each IOX is recognised before completing MyInstall.

Geotab's overall harness rules still apply on the vehicle side: total harness length no more than 2 m (6.5 ft) and no T-harness connected to another.

Schematic only: the RX06S4 links the GO RUGGED to the first IOX, further modules daisy-chain on, and the power budget covers the whole chain.

Spec	Detail
Part number	HRN-RX06S4
Type	6-way IOX harness
Device	GO RUGGED (required for any IOX add-on)
Length	100 cm / 39 in
Weather protection	Gray connector is weather resistant; harness only partly IP67
Max connected cable length	1 m / 3.2 ft
IOX port pins on device	Pins 2 to 5: CAN Low, CAN High, power, ground
IOX current budget	2750 mA maximum across the daisy chain
Country of origin	China

What Should You Watch for When Fitting It?

The 1 m connected length is the easiest limit to break, especially when a module needs to sit near the equipment it monitors. Plan the layout before drilling or mounting anything. Leave the gray connector in place, since Geotab notes it is the only weatherproof element and removing it reduces protection. Total up IOX current draw before adding modules to an existing install. Also note Geotab's limits on what the GO RUGGED can read: it does not support single-wire CAN or medium-speed CAN, so some seat belt and odometer data on certain vehicles is not available through an IOX either.

Which Related Harnesses Should You Compare?

HRN-IOXEXT-A: a special-order 2 m extension that lets IOX hardware mount away from a GO device or links two IOX units.
HRN-RS12S2: the GO RUGGED's vehicle-side harness for 16-pin ports, with the same style of gray weather-resistant connector.
HRN-GR09K1: the IP67 rugged 9-pin T-harness kit that connects the GO RUGGED to heavy-duty diagnostic ports.

What Are Common Questions About the HRN-RX06S4?

Do you need the HRN-RX06S4 to add an IOX to a GO RUGGED?

Yes. Geotab's GO9 RUGGED documentation states the HRN-RX06S4 is required to install any IOX add-on on that device.

Why is the HRN-RX06S4 maximum connected length only 1 m?

Geotab lists a 1 m (3.2 ft) maximum connected cable length for this harness, half the 2 m figure that applies to most of its harnesses. We plan IOX placement around that limit.

How many IOX modules can run from a GO RUGGED?

Geotab gives a budget rather than a count: the combined maximum draw of all IOX devices in the daisy chain must not exceed 2750 mA, so we add up each module's rating before designing the install.

API Signal supplies and installs GO RUGGED devices, IOX modules and the harnesses that connect them, on site at the customer's yard. Call 803-513-1009 or use Get a Quote to add inputs, outputs or driver feedback to your equipment.

Sources: Geotab GO9 RUGGED; Geotab Harness Identification and Application. GEOTAB is a registered trademark of Geotab Inc. API Signal is an independent installer and is not Geotab.

Every Geotab Harness →All 83 harnesses and accessories by part number. Get a Quote →The HRN-RX06S4 supplied and installed on one written quote.

Geotab HRN-RX06S4 Harness