CAT Adjustable Power Harness

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Do you own an electronic caterpillar engine?

Want to save fuel and run better too?

These are the best set of power harnesses on the market. This is for an adjustable boost harness and fixed fuel temp harness. The adjustable set up gives you the ability to control fuel rate at your fingertips. They have been built and tested by a CAT master mechanic.

They were developed and tested for two years before being sold to the public. Many have imitated but never duplicated the Diesel Freak brand of caterpillar power harnesses. Dyno results from 10 different trucks show increases in horsepower around 90 hp and torque around 250 ft lbs.

Increases in fuel mileage have been from .5 mpg to as high as 2 mpg depending on the application. These harnesses were built to increase fuel mileage and power. They can save you thousands of dollars in fuel costs.

Harnesses are professionally built and tested before shipping. This product is made in the USA and carries a limited warranty. If for any reason you do not like the results we offer a 100% money back guarantee. Simply return the product within 60 days for a full refund.

These harnesses will NOT work on the C-15 bridge engine serial prefix MBN or the SDP Particulate.  They also do NOT work on the C-13 LEE serial or the C-12 MBL 

When placing an order you must have your engine serial to make sure you choose the correct option and get exactly what your engine needs.  

Contact us for more information and to see if other tuner options are available.

Diesel Freak, LLC is not affiliated with Caterpillar or the Caterpillar brand.


QUESTION: How do they work?

ANSWER: There is a fuel temp harness that you plug in between your fuel temp sensor and your wiring. That will advance the timing on your engine. The second harness plugs into your boost pressure sensor and alters the fuel rate to the motor. You can have that fixed or adjustable.


QUESTION: Will these harnesses effect the longevity or reliability of my engine?

ANSWER: No. We have never experienced an ill effect by running these harnesses on any motor. The factory has maximum parameters already programmed into your ECM on your engine. All we do is go to those max parameters. We cannot make it go past those. Your engine is still within the maximum allowable specs of your engine set by your factory.


QUESTION: Will this effect my engine warranty?

ANSWER: No. We are an ADD-ON after market product. To date after 15 years of service, we have not had a single warranty issue. If you do not want/like the product, just remove it and it leaves no trace or footprint on the engine or in the ECM.


QUESTION: How hard is it to install?

ANSWER: With every harness order you get detailed instructions sent along with a wiring diagram of your engine. The fixed harness typically takes 5 minutes. The adjustable harness could take up to an hour.


QUESTION: What are the exact gains?

ANSWER: CAT Engines vary alot within and out of models. Typically the single turbo cab gain about 75 horse power 150 ft lbs of torque. Twin Turbo Acers gain about 80 HP and 200 ft lbs of torque. For fuel, single turbo’s gain about .75 to 1 mpg. The Twin Turbo’s gain about 1 to 1.25 MPG.


QUESTION: What Models are supported?

ANSWER: Our CAT Power harness fit a wide range of engines. Typically from 1994 to 2008. They will fit your 3406E C12, C13, C15, C16 Engine. If you have any questions about your engine or if it isn’t one of those, call us. We’ll tell you if your engine will be compatible.


QUESTION: Will my engine run differently?

ANSWER: Yes it will. There will be no more turbo lag, virtually eliminated and your throttle response will be quick and crisp.

Diesel Freak, LLC is not affiliated with Caterpillar or the Caterpillar brand.

Additional information

Weight 1 lbs
Dimensions 13 × 10 × 1 in
Engine Prefix

1LW, 1MM, 1YN, 2KS, 2WS, 4AS, 5DS, 5EK, 6NZ, 6TS, 7CZ, 9NS, 9NZ, BXS, C2A, KCA0001-KCA6122, KCA6123-KCA9999, KCB00001-KCB39998, KCB39999-KCB99999, MXS00001-MXS25317, MXS25318-MXS99999, NXS