How to Run Wire From Engine to Inside Car

If you’re like most car enthusiasts, then you love tinkering with your car. Whether it’s changing the air filter or replacing the spark plugs, there’s always something to do. But did you know that there’s another way to connect your engine to your car? By using wire!

What You’ll Need

First and foremost, you’ll need a few items before getting started:
-A wire stripper/cutter
-Wire cutters or a knife

-A voltmeter

-An electrician’s tape measure
-A connector (or pigtail)
-Tin snips or a scissors

-The car’s engine bay

Once you have all of the necessary supplies, it’s time to get started! Here are the steps you’ll need to take:
1. Disconnect the battery and ground cables from the car. These can be found behind the front right corner of the car.
2. Remove the stereo or other accessories if there are any. This will give you more room to work.
3. Trace the wire from the engine bay to where you want it to go inside the car. Use your voltmeter to see what voltage is running through the wire. You’ll need this information to determine how much voltage you need to provide to your new wire installation.
4. Strip about 2 inches of insulation off of one end of the wire. 

How to Run Wire from Engine to Inside Car

Running wire from an engine to an inside car can be done a few different ways, depending on the vehicle and engine. Two popular methods are using a serpentine belt and using a transmission tunnel.

Using a serpentine belt is the easiest way to run wire from an engine to inside the car. A serpentine belt uses metal strands that run around a pulley, making it easy to connect the engine and car. The downside of this method is that it requires some modification to the car, such as adding a pulley or changing the belt size.

See also  Why does My Car Engine Overheat

The second method is using a transmission tunnel. This method uses a sleeve that screws onto the gearbox of the car and fits over the transmission shaft. The sleeve has two openings: one near the engine and one near the car’s interior. The wire runs through these openings and out of the other side. This method is more expensive than using a serpentine belt, but it’s easier to install because there is no modification required to the car.

Tips for Safe and Effective Wire Harnessing

When it comes to wiring your vehicle, there are a few things you need to keep in mind. One of the most important aspects is making sure the wire is properly insulated. This will help to prevent any potential electrical fire or injury. Another thing to keep in mind is using the correct type of connector. Not all connectors are created equal, and can create problems if used incorrectly. Finally, make sure you have a good understanding of the car’s electrical system before beginning any wiring. There are a number of resources available online that will help you get started.


Running wire from your engine to the inside of your car can be a daunting task, but with the right tools and some knowledge, it can be done relatively painlessly. When you are planning on wiring your car, make sure to take into account things like engine size and torque, electrical requirements for the car model you are working with, as well as how much insulation is required along the wire path. Armed with this information, you can get started on wiring your car without any trouble at all!

DynoCar is the best place to find information on all things cars, whether it be a car buying guide or how to change your oil. We’ve made finding and staying in touch with car information easy and fast.



About Us



DynoCar - All About Cars

(440) 999 3699

590 Monterey Blvd San Francisco, CA 94127

Information contained herein is for informational purposes only, and that you should consult with a qualified mechanic or other professional to verify the accuracy of any information. shall not be liable for any informational error or for any action taken in reliance on information contained herein.