VT100 Manufacturer and Harness Information
This article provides guidance on selecting the correct Harness Type for connecting Tracking or ELD Devices to Vehicles based on Manufacturer, Model Year, Diagnostic Port Type, and Vehicle Voltage. It outlines the differences between light-duty and medium-/heavy-duty OBD-II harnesses, as well as specialized options like the 6-pin JBus adapter, 9-pin heavy-duty harness, 14-pin RP1226 harness, and 3-wire hardwire harness. Notes are included for specific manufacturers such as Freightliner and Paccar, along with voltage requirements for proper installation. The information helps ensure correct hardware selection for reliable device operation.
Manufacturer / Model Year / Applicable Harness Type
*Freightliner 2019 - 2020, models M2 106, M2 112, 108 SD and 114 SD, may use the RP 1226.
**Paccar (Peterbilt and Kenworth) – Cab size > 2.1 meters. 2 Medium- and heavy-duty vehicles with 24V supply voltage
1 Light-duty vehicles with 12V supply voltage
2 Medium- and heavy-duty vehicles with 24V supply voltage
OBD-II Harnesses
Light Duty (LD) is for cars, vans, and other LD vehicles. Offers 12V supply voltage. (Such as Light Duty (Type A) harness)
Medium- and heavy-duty is for larger vehicles, including CMVs. Offers 24V supply voltage. (Such as Heavy Duty (Type B) harness)
6-Pin JBus Adapter
9-Pin Heavy-Duty Harness
A 9-pin heavy-duty harness for use in most medium- and heavy-duty vehicles.
14-Pin RP1226 Harness
This harness is for heavy-duty applications and is designed for vehicles | with an RP1226 diagnostic port.
3-wire Hardwire Harness
A three-wire harness that connects to power, ground, and ignition. This harness is used for installation in vehicles where no diagnostic port is available, due to the age or type of vehicle. Not recommended for clients using Encompass® Vehicle Tracking Plus.
Black wire: Ground | White wire: Ignition | Red wire: Power