Geotab HRN-RZ04T4 Harness

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What Is the HRN-RZ04T4?

The HRN-RZ04T4 is a harness that connects a Geotab GO RUGGED to equipment powered by a Kubota engine, covering both gasoline and diesel versions. Geotab names its purpose as the Kubota type engine MA-40-36 in ground service equipment, and lists it among the harnesses required for that equipment class. It is 110 cm (43 in) long.

Kubota engines turn up in a wide range of compact machinery, and airport ground fleets are a notable example. Baggage tractors and other ramp equipment can use compact industrial engines that were never designed with telematics in mind. Geotab's GO9 RUGGED documentation describes this part as the Kubota engine interface for ground service equipment, which is the context where it is most often specified.

Which Vehicles and Devices Does the HRN-RZ04T4 Work With?

The harness is used with the GO RUGGED and is listed for Kubota gasoline and diesel engines. Geotab's stated application is the Kubota type engine MA-40-36 in ground service equipment, and its GO9 RUGGED documentation places the HRN-RZ04T4 alongside the HRN-RW04K4 differential harness, the Ford EDI tug interface and the pulse harness as the set needed for that sector.

Geotab does not show a part replaced by the HRN-RZ04T4, and it does not name a base harness requirement. The harness length is 110 cm, which uses more than half of the 2 m total connected cable limit. That leaves about 90 cm for any approved straight extension, so device placement should be planned before ordering.

What Problem Does It Solve on the Job?

Ground handling companies and airport operators manage large pools of shared equipment that move constantly between gates. Supervisors need to know which tractor is where, how long each unit ran during a shift, and when the next service is due. Some of these units are older and run without a data-rich engine computer, so ordinary telematics wiring gives a poor picture of engine activity.

The Kubota harness gives the GO RUGGED a defined connection to the engine rather than a guessed tap into the wiring. That produces dependable on and off timing for utilisation reports, and supports service planning based on actual run time. When a fleet runs both Kubota and Ford powered tugs, matching each unit to its own engine harness keeps the data consistent across the whole ramp.

How Is the HRN-RZ04T4 Installed?

Geotab publishes installation instructions for this harness. Combined with the GO RUGGED installation guide, the process our team follows runs like this:

1. Record the device serial, the equipment number and its hour meter, and check that the engine is a Kubota that matches this harness. Add the device serial to the database before starting.
2. Park the unit in a safe work area away from active aircraft movement, switch it off and keep the GO RUGGED unplugged.
3. Locate the engine connection point described in Geotab's Kubota instructions and make the harness connection there.
4. Route the 110 cm harness toward the chosen device location, away from the exhaust, the fan and any moving linkage.
5. Keep the full harness chain under 2 m (6.5 ft) and never stack two T-harnesses.
6. Mount the device on a solid surface with a clear sky view and secure the harness at regular intervals with cable ties, tying both sides of every joint.
7. Start the engine, wait for all three LEDs to go solid, then confirm Pass in MyInstall and enter the asset details.

Which Related Harnesses Should You Compare?

• HRN-RZ04T41: the Ford EDI tug T-harness for the Ford MSG-425 engine.
• HRN-RW04K4: the differential harness for negative disconnects and oil pressure switch signals.
• HRN-RW03K5: the pulse harness for engines with no ignition or RPM signal.
• HRN-RL12K2: an engine-based kit for off-road machines with Deutz engines.

What Are Common Questions About the HRN-RZ04T4?

Does the HRN-RZ04T4 work on both gas and diesel Kubota engines?

Yes. Geotab describes it as a harness for Kubota gasoline and diesel engines.

Why is it 110 cm long when most rugged harnesses are much shorter?

Geotab does not give a reason, but on ground equipment the engine can sit well away from a good device location. The extra length helps bridge that distance while staying inside the 2 m maximum.

Is the HRN-RZ04T4 the same as the Ford EDI tug harness?

No. The HRN-RZ04T41 is the Ford EDI tug T-harness for the Ford MSG-425 engine, while the HRN-RZ04T4 covers Kubota engines.

API Signal can supply the Kubota harness and GO RUGGED and fit them across your ground equipment pool on site, unit by unit. Get in touch at 803-513-1009 or through Get a Quote.

Sources: Geotab harness identification, Kubota entry, Geotab Kubota harness installation instructions, Geotab GO9 RUGGED ground service equipment notes, Geotab GO9 RUGGED installation guide. GEOTAB is a registered trademark of Geotab Inc. API Signal is an independent installer and is not Geotab.