Detroit Series 60 12.7L DDEC IV Swap Harness — Cascadia 2009-2016
12.7L DDEC IV — independent switches
$1,650.00
Sale price
$1,650.00
Regular price
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DETROIT SERIES 60 · DDEC IV · 12.7L
Detroit Series 60 12.7L DDEC IV Swap Harness — Cascadia 2009-2016
$1,650.00
Sale price
$1,650.00
Regular price
- Works or we
swap it: 30 days - Ships next
business day - Free U.S.
shipping
Works or we swap it: 30 days · Ships the next business day from Houston, TX · Tech support in English and Spanish on WhatsApp
Save dozens of labor hours: the electrical side of your swap arrives solved and tested, no splice-by-splice wiring.
- Engine: Detroit Series 60 12.7L with DDEC IV ECM
- Cab: Freightliner Cascadia 2009–2016
- Installation: Plug & Play through the factory firewall opening, no cutting, fully reversible
- Includes: engine harness + in-cab harness (+ integrated module, depending on configuration)
- Dash: every gauge and warning light working 100%
Which configuration is mine?
- 12.7L DDEC IV, with dash switches for cruise and engine brake → «Without module» — $1,650
- 12.7L DDEC IV, keeping the factory steering-wheel buttons → «With module» — $3,030, arrives integrated and tested
- Is your cab a Kenworth T680? → go to the T680 harness
- 14.0L DDEC V → this isn't your harness: go to the 14.0L DDEC V harness
Not sure? Send us your cab year and a photo of the ECM label on WhatsApp: we confirm the right configuration before you pay.
Two-harness system to fit your Detroit Series 60 12.7L DDEC IV into a Cascadia
A two-harness integration system to install a Detroit Diesel Series 60 12.7L with a DDEC IV ECM in a Freightliner Cascadia 2009–2016 cab, which came from the factory with a DD13 or DD15. It handles the whole electrical side of the swap or repower. Every harness is built in our Houston lab, with controlled crimping and pin-to-pin continuity checks.
Everything about this harness
Two installation modes
The DDEC IV uses the J1587 protocol, so cruise and engine brake don't talk to the factory steering-wheel buttons. That's why there are two configurations:
Without module ($1,650). The harness comes ready to wire cruise and engine brake to independent dash switches. They work perfectly, just not from the steering wheel. It's the most affordable option and the most common among experienced mechanics.
With module ($3,030). A communication module translates the steering-wheel signals into what the DDEC IV understands, so the Cascadia's factory buttons keep working. We don't sell the module on its own: our team integrates it into the harness and tests it before shipping, because a wrong connection can damage the ECM, the harness or the module.
What the system includes
1. Engine harness (engine ↔ cab): connects the DDEC IV ECM to batteries, starter, ignition signal, fan clutch, coolant level sensor and A/C.
2. In-cab harness: accelerator pedal, cruise and engine brake (switches or steering wheel, depending on configuration), dash with every gauge and warning light, and ECM ↔ cab communication (J1587).
In the box: both harnesses, labeled terminals and connectors, basic instructions, quality inspection certificate (QC pass) and reinforced packaging (15" × 11" × 3.25").
Technical specifications
| Field | Detail |
|---|---|
| System | 2 harnesses (engine + in-cab) in one kit |
| Engine | Detroit Diesel Series 60 12.7L |
| ECM | DDEC IV (DDEC 4) |
| Cab | Freightliner Cascadia 2009 – 2016 |
| Installation | Plug & Play through the factory firewall, no cutting |
| Protocol | J1587 |
| Wire | 18 AWG engine; 16 AWG injectors. SAE J1128 certified automotive wire, heat, oil and diesel resistant |
| Termination | Crimped terminals with verified pull-test |
| Protection | Corrugated loom + heat shrink at branch points |
| SKU | HRN-CTS-INT-CAS-0917-DDEC4-EIH-ESS-V1 |
What it does NOT include
- The communication module in the «Without module» configuration
- The physical cruise and engine brake switches (available at any electrical parts store)
- The DDEC IV ECM (message us if you need one programmed)
- Sensors, injectors or the injector sub-harness
- Chassis or transmission harness
- The mechanical side of the swap (mounts, fuel lines, cooling)
Shipping
- Without module: ships the next business day from Houston, TX
- With module: 3 to 5 extra business days for integration and testing
- U.S. via UPS · Latin America via DHL Express with duties prepaid (DDP) to 13 countries
FAQ
Do I have to cut or modify my Cascadia?
No. It uses the factory firewall opening and never cuts the cab harness. The install is reversible.
Will the dash gauges read right with the Series 60?
Yes. The in-cab harness carries the communication so gauges, warning lights and DDEC IV readings work with the factory dash.
My truck already has a Series 60 from an earlier swap. Will it fit?
Yes, as a replacement if that swap's harness failed.
Is it a factory harness?
There is no factory harness for this swap, because the Cascadia never came with a Series 60. It's an integration system designed and built by CTS for that combination.
What if it arrives defective?
Let us know within 48 hours with photos and the serial number, and we replace it at no cost.
Do you help during installation?
Yes, in English and Spanish on WhatsApp, phone and email.
Built by CTS in Houston, Texas. CTS is a diesel electronics lab: we build harnesses and bench cables, program ECMs and teach at CTS Academy.
Works or we swap it: 30 days when CTS is at fault (exchange, not refund) + 12 months against manufacturing defects. CTS is an independent manufacturer; Detroit Diesel, Freightliner and Cummins are mentioned only to show compatibility.