# 2.5 | Selecting System Components
**Correct component selection is important for reliable installation and operation of the COMMAND system. Harnessing requirements will vary depending on tractor model, implement configuration, GNSS receiver type, and hydraulic interface. For assistance selecting compatible components, use the COMMAND kit picker at t3rra.com or contact T3RRA.**
Factors that will affect harnessing requirements include:
- Tractor brand
- Tractor model
- Scraper brand
- Scraper model
- GNSS receiver model
- Available Electrohydraulic Valves
### Harnessing Compatibility
The **COMMAND** harnessing system has been designed to allow us to leverage existing customer and dealer knowledge of tractor and implement harnessing systems. We can then take advantage of this familiarity on the technical support front, while leveraging the fact that dealers also possess many of these parts in stock at-the-ready.
#### Typical CNH Components
| **SKU / Part No.** | **Name** |
| 115-0172-397 OR 115-0172-398
**OPTIONAL POWER**
| Constant Power Harness (Row Crop) OR Constant Power Harness (Articulated)
|
| 115-7100-009 OR 115-7100-010
**REQUIRED**
| Front Extension Wiring Harness Kit |
| 115-7100-005
**REQUIRED**
| Cable Adapter Terminator Gen I ISOBUS |
| 92179218 OR 92317566
**REQUIRED IF NO ISO IBBC PRESENT**
| Row Crop Tractor ISO Connector OR Articulated Tractor ISO Connector
|
#### Typical John Deere Components
| **SKU / Part No.** | **Name** |
| BPF10403 OR BPF10404
**OPTIONAL**
| Constant Power Harness (Row Crop) OR Constant Power Harness (Articulated)
|
| BPF11117
**REQUIRED**
| Front Extension Wiring Harness Kit (including terminator module) |
| RE174725 OR RE174726
**REQUIRED IF NO ISOBUS PRESENT**
| GreenStar™ Ready Field Installation Kit (Rowcrop) OR
GreenStar™ ISO Implement Connector Field Installation Kit (Articulated)
|
| BPF12658
**REQUIRED IF USING STARFIRE GNSS**
| Implement Receiver Wiring Harness Kit
|
| BPF10547
**RECOMMENDED**
| iGrade Counterbalance Valve kit - highly recommended if the implement has no existing counterbalance mechanism
|
### Base COMMAND Components
The components below are required for a base **COMMAND** installation.
| **SKU / Part No.** | **Name** |
| T3H-E001 | COMMAND ECU – Controller Only |
| T3H-L001 | COMMAND ECU Licence – Licence Only |
| T3H-C002-1 | COMMAND ECU Adapter - CAN & Analog V2 |
| T3H-C003 | COMMAND Arm/Engage Switch Adapter |
| T3H-C004 | COMMAND Arm/Engage Switch |
| T3H-C005 | COMMAND ISOBUS/Ext Breakout Adapter |
| T3H-C006 | COMMAND Cab Breakout Adapter |
| T3H-C008 | COMMAND Cab/Ext Extension Adapter |
| T3H-T001 | Tablet Serial Interface Adapter (RA 4m)
|
### Optional COMMAND Components
Components listed below are optional for **COMMAND** and will only be required for certain tractor models, scraper models, GNSS receivers, Tilt sensors or Electrohydraulic valves.
| **SKU / Part No.** | **Name** |
| **Tractor Harnessing** | |
| T3H-F001 | Cab Convenience Power Adapter |
| T3H-F002 | External Loose End Power Adapter |
| T3H-F003 | COMMAND Inline Fuse Adapter |
| T3H-J001 | COMMAND Joystick Adapter – 4m Extension |
| T3H-M001 | COMMAND J1939 Diagnostic Adapter (Green) |
| T3H-T002 | Tablet Serial Interface Adapter (RA 6m) |
| T3H-V001 | COMMAND Legacy Analog Output Adapter |
| T3H-V002 | Valve Adapter – 6m Extension |
| T3H-V003 | Valve Adapter – Prop. Solenoid (2-way DT) |
| T3H-V005 | COMMAND Tractor CAN Valve Adapter |
| **Implement Harnessing** | |
| T3H-E003 | COMMAND Inclination Sensor – TARS-B |
| T3H-G001 | COMMAND NMEA Extension Harness (8m) |
| T3H-G002 | COMMAND Impl Adapter – NAV-900 / Ag372 |
| T3H-G003 | COMMAND Impl Adapter – Emlid Reach RS2/RS2+/RS3 |
| T3H-G004 | COMMAND Trimble NMEA Output Adapter |
| T3H-G007 | COMMAND NMEA Extension Harness (12m) |
| T3H-S001 | COMMAND Impl Adapter – Stub Junction
|
| T3H-S003 | COMMAND Impl Adapter - TARS Extension
|