DiMarzio EJ Custom Wiring Diagram

DiMarzio EJ Custom wiring

This time we are going to provide a DiMarzio EJ Custom wiring diagram, to help you get this great-sounding humbucker installed into your guitar. The DiMarzio EJ Custom is a pickup designed to the exacting specifications of well-known guitar virtuoso Eric Johnson. This pickup is said to have a bright tone with a lot of presence, but it doesn’t become brittle or harsh, even when playing high-pitched solos. It also never becomes muddy, no matter how much overdrive you add. It uses an Alnico 5 magnet and is available in several colors.

Tools and Materials for Your DiMarzio EJ Custom Wiring

You will not need a lot of tools to install your DiMarzio EJ Custom. A soldering iron, a small amount of solder, electrical tape, and a screwdriver should be all you need to complete the project.

  • Soldering iron
  • Solder
  • Electrical tape

Wiring Code

All pickups have a wiring code. Humbuckers have four colored wires and one bare wire, but to install a pickup, we only use a HOT wire and a GROUND wire. The wiring code tells us how to find them. You can figure out the wiring code using a voltmeter, but since we are using a DiMarzio EJ Custom, we already know the wiring code is as follows:

DiMarzio EJ Custom Wiring Code

  • Red = Hot
  • White + black = twisted together and taped
  • Green + bare = twisted together = Ground


We’ve illustrated this wiring code for you in Example 1.

Example 1

Uninstall the Old Pickup

Before we can install the DiMarzio EJ Custom, we need to remove the old pickup. To do that, you will likely need to remove the strings. Use the screwdriver to remove the screws that hold the pickup in place. Also, remove the screws that hold the control panel cover in place, so you have access to the wires inside.

With the pickup screws removed, you should be able to find which wires are coming from your pickup and where they connect in the control panel. Use the soldering iron to loosen the joints and free the wires so you can remove the pickup, but before you do make sure you take accurate notes so you will know where to solder the wires for the DiMarzio EJ Custom.

The DiMarzio EJ Custom Wiring Installation

To install the DiMarzio EJ Custom, you will reverse the process you used to uninstall the first pickup. Feed the wires through the holes, or channels until you can see them in the control panel. The red wire is the Hot, and this wire goes to a lug on the Volume pot, or it goes to the pickup selector switch. The Ground will go to the back of the volume pot. These positions should sound familiar since you just removed those wires.

We have illustrated a common way to install DiMarzio EJ Custom in a Gibson Les Paul style guitar in Example 2

Example 2

We have illustrated a common way to install the DiMarzio EJ Custom in a Super Strat-style guitar in Example 3.

Example 3

Once you solder the wires in place, you can replace the screws and string up the guitar.

Project Complete!


Changing pickups in your guitar is not very difficult, and it can have a huge impact on your sound. The DiMarzio EJ Custom is a great sounding pickup, especially suited for fast playing. Whether it be clean or with heavy overdrive, the DiMarzio EJ Custom will sound clear but not brittle.

If you have enjoyed reading over this short DiMarzio EJ Custom wiring tutorial and it has helped you get the sound you’re after, please share it on Facebook and Twitter.

Ed Malaker Our resident electronics wizard came by his skills honestly — first as an apprentice in his father’s repair shop, later as a working musician and (most recently) as a sound designer for film. His passion for guitar led him to Humbucker Soup, where he continues to decode the wonders of wiring and the vicissitudes of voltage. Ed has never taken his guitar to a shop — he already knows how to fix it.