CAT Adjustable Power Harness

Regular price



Introducing our CAT Adjustable Power Harness

  • QUESTION: How does the CAT Adjustable Power Harness 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 of the CAT Adjustable Power Harness?

  • 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.

Customer Reviews

Based on 9 reviews

Great product

John Chesson
379 Pete

Works great, easy installation. Haven’t had it long enough to give true gains.
The throttle response is a lot better the turbo pressure is definitely higher about 10 to 15psi and the ability to roll a little coal when you want to is nice 👍

Leonard McCrummen
Power and fuel improvement

I have 2007 Freightliner Columbia c-13 cat with a 10 speed trans improved my fuel by 3/10 to the gallon power improvement is amazing I pull logs and on average gross out at 90,000+ #'s and on hills where I was dropping a gear I top it in 10th hands down best 300$ I've ever spent thanks Diesel Freaks great products

Daryle Washington
Power harness


Samuel Pena
Cat Power harness

Really happy with it so far can definitely fill the difference