Detroit Series 60 12.7L DDEC IV Engine Harness — Replacement
$549.00
Sale price
$549.00
Regular price
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DETROIT SERIES 60 · DDEC IV · 12.7L
Detroit Series 60 12.7L DDEC IV Engine Harness — Replacement
$549.00
Sale price
$549.00
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
- Engine: Detroit Diesel Series 60 12.7L with DDEC IV ECM
- Type: replacement engine harness, built by CTS
- Application: any truck with the factory Series 60 12.7 DDEC IV (Freightliner, Western Star, Kenworth, Peterbilt and more)
- Wire: SAE J1128 certified automotive wire, heat, oil and diesel resistant
- Verification: pin-to-pin continuity against the DDEC IV diagram before shipping
Before you buy, we check compatibility for FREE on WhatsApp with a photo of your ECM or your engine serial number.
The harness that brings your Series 60 12.7's electronics back to life
This is the engine harness for the Detroit Diesel Series 60 12.7L with a DDEC IV ECM: the wiring that connects the ECM to the engine sensors, with the connectors of the factory configuration. Built by CTS in Houston, part of our CTS Precision Series™ line.
After 20+ years of heat, oil and vibration, the original harness on these engines is one of the most common causes of "ghost" electrical faults. If your truck shows any of these symptoms, the harness is the first suspect:
- Sensor codes that come and go for no reason
- Erratic temperature, oil pressure or coolant readings
- Derates or an intermittent check engine that "fixes itself"
- Dry, cracked or peeling insulation near the engine
- Stacked splices from previous owners
A harness patched splice over splice is never reliable again. Replacing it completely fixes the problem at the root and saves you weeks of chasing bad contacts.
Everything about this harness
Why this harness lasts
- SAE J1128 certified automotive wire, the same grade as our swap harnesses
- Terminals crimped with calibrated tooling and a verified pull-test
- Corrugated loom + heat shrink at branch points
- Pin-to-pin continuity verified against the DDEC IV diagram
- SKU and version marked on the harness + inspection certificate (QC pass)
Technical specifications
| Field | Detail |
|---|---|
| Product | Replacement engine harness |
| Engine | Detroit Diesel Series 60 12.7L |
| ECM | DDEC IV (DDEC 4) |
| Application | Trucks with a factory Series 60 12.7: fits by engine, not by cab |
| Line | CTS Precision Series™ · Essential grade |
| Wire | SAE J1128 certified automotive wire |
| Termination | Crimped terminals with verified pull-test |
| Protection | Corrugated loom + heat shrink at branch points |
What it does NOT include
- The injector sub-harness (a separate product: message us if you need it)
- Engine sensors
- The DDEC IV ECM (message us if you need one programmed)
- It isn't for swaps: if you're installing the Series 60 in a cab that didn't come with it, you need our integration system
Shipping
- Ships the next business day from Houston, TX
- U.S. via UPS · Latin America via DHL Express with duties prepaid (DDP) to 13 countries
FAQ
Does it include the injector harness?
No. This is the engine (sensor) harness. The injector sub-harness is separate: message us on WhatsApp if you need it too.
Does it work with DDEC III or DDEC V?
It's specific to DDEC IV. If you have a DDEC III or DDEC V, message us and we'll confirm availability.
Will it fit my truck?
If it has a factory Series 60 12.7L with DDEC IV, whether Freightliner, Western Star, Kenworth or Peterbilt, it fits by engine. If in doubt, send us a photo of the ECM or your current harness.
Is it a Detroit harness?
No. It's a replacement harness designed and built by CTS, with the same functions and connectors as the original, SAE J1128 certified wire and pin-to-pin verification.
What if it arrives defective?
Let us know within 48 hours with photos and the serial number, and we replace it at no cost.
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.