Mastering Geotab
★ Geotab Harnesses · Heavy-Duty Deutsch Harnesses
The HRN-GS09K2-A is Geotab's universal heavy-duty T-harness kit for 9-pin Deutsch diagnostic ports, sold with four swappable mounting adapters so one box fits most trucks. It was designed for installs where nobody knows the exact truck in advance.
The HRN-GS09K2-A is a universal 9-pin heavy-duty T-harness kit that connects a GO device to the round Deutsch diagnostic port found on medium and heavy-duty trucks. Inside the box is the 9-pin T-harness itself, part HRN-DM09T2-A, plus four mounting adapters, with Adapter 1 already fitted at the factory. The harness measures 68 cm (27 in).
Geotab's description stresses one idea: the kit is meant to work without knowing the vehicle's details ahead of time. Trucks from different builders hold their diagnostic connector in different brackets, and instead of stocking a separate harness for each mounting style, the adapter swap lets one part fit them. It is also a relocation tool, moving the GO device away from a port that sits in the driver's way or deep in a recess. It replaces the older HRN-DR09T2 and HRN-DS09T2.
Geotab aims this kit at medium and heavy-duty vehicles with a 9-pin Deutsch diagnostic port, which its cheat sheet describes as common on heavy trucks from roughly 2000 onward. Geotab's own examples for this kit include many trucks from the 2000s and 2010s, fire trucks among them. The cheat sheet pairs the HRN-GS09K2-A with GO9 devices; for a GO10, the matching part is the HRN-XGS09K2.
Two vehicle notes from Geotab stand out. For 2017 and newer Kenworth and Peterbilt trucks with Paccar MX engines, Generation 9 and newer devices are directed to the HRN-GS09K2 or the HRN-DR09S4. On 2017 IC PB105 school buses, straight 9-pin harnesses need their pins rearranged, while the HRN-GS09K2 needs no modification, which makes this kit the simpler choice on that bus.
Mixed heavy fleets are where this kit earns its place. A yard with a few older conventional tractors, a dump truck and a couple of vocational units can present several bracket styles on the same day. With one kit and four adapters in the van, our technician matches the bracket on the spot instead of discovering a mismatch after the truck has been pulled out of service.
Because it is a T-harness, the factory connector stays in use. The vehicle's own diagnostic plug reconnects to the harness, so the shop can still reach the port with its diagnostic software while the GO device rides on the third leg, out of the driver's knee space.
With the truck parked and the key off, the in-vehicle diagnostic connector comes out of its bracket, following whatever retention method that builder used. The harness's male 9-pin connector then goes into the same bracket and is secured. Geotab's step-by-step for the GO10 version of this kit, which uses the same four-adapter approach, says screw-mount adapters are fastened with screws and thread-mount adapters with their matching nuts, which are not interchangeable. The factory connector then plugs into the harness's female end and is locked with its ring, and the GO device connects to the long 16-pin leg.
Changing adapters is a bench job done with the harness disconnected from the truck: back off the cap at the rear of the male connector, slide the connector and adapter off the terminal cartridge without disturbing the nine terminals, fit the new adapter on its notch with no gap, then reassemble and tighten the cap.
Route the device leg along existing wiring, keep it clear of the pedals, and cable-tie the GO device and the harness so neither can fall. Geotab limits the connected cable to 2 m (6.5 ft) and forbids joining one T-harness to another. Last, start the engine, let the device initialize, confirm the LEDs, and finish the MyInstall check so the truck appears with engine data in MyGeotab.
| Spec | Detail |
|---|---|
| Part number | HRN-GS09K2-A |
| Type | Universal 9-pin heavy-duty T-harness kit |
| Kit contents | 9-pin T-harness HRN-DM09T2-A and 4 mounting adapters (Adapter 1 pre-installed) |
| Length | 68 cm (27 in) |
| Replaces | HRN-DR09T2 and HRN-DS09T2 |
| Device | GO9 (GO10 counterpart: HRN-XGS09K2) |
| Max connected cable length | 2 m (6.5 ft) |
| California note | California prohibits relocating the in-vehicle diagnostic connector; Geotab points to its direct plug-in method there |
| Country of origin | Taiwan |
Pick the adapter by the shape of the truck's bracket, not by habit, and check that the adapter sits flush against the cap with no gap before you mount it. Treat the nine terminals gently during an adapter change, because a pushed-back pin gives an intermittent data fault that is miserable to trace later. Keep the matching nut with its adapter. Before mounting anything, compare the port against Geotab's notes: a 2009 Nissan UD, for example, has two diagnostic ports and should be connected at the 9-pin.
The 9-pin T-harness HRN-DM09T2-A and four mounting adapters, with Adapter 1 fitted at the factory.
Geotab pairs it with GO9 devices. For a GO10, the matching 9-pin kit is the HRN-XGS09K2.
Geotab lists it as the replacement for the HRN-DR09T2 and the HRN-DS09T2.
We bring the HRN-GS09K2-A kit with all four adapters and the GO devices to your yard and fit each truck on site, adapter matched to the bracket in front of us. Ring 803-513-1009 to set a date, or fill in Get a Quote with your truck list.
Sources: Geotab Harness Identification and Application, Geotab HRN-XGS09K2 document, Geotab harness cheat sheet, Geotab vehicle-specific installation notes, Geotab guide to telematics harnesses. GEOTAB is a registered trademark of Geotab Inc. API Signal is an independent installer and is not Geotab.
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