So you've decided to upgrade your guitar's electronics. Smart move. You've got your 920D Custom wiring harness on the way, and now you're wondering can I actually do this myself?
Short answer: yes. If you can follow instructions and hold a soldering iron without setting your workbench on fire, you can handle this. It's not brain surgery. It's just a few wires, some solder joints, and a little patience. Let's walk through it step by step, so you know exactly what you're getting into before you crack open your guitar.
WHAT YOU'LL NEED
Before you start, gather your tools. You probably have some of this already, and the rest is easy to find:
- A soldering iron (25-40 watts is plenty)
- Solder (rosin core, not acid core)
- Wire cutters or flush cutters
- Screwdrivers (Phillips and flathead, depending on your guitar)
- Needle-nose pliers (helpful but not mandatory)
- Desoldering wick or a solder sucker (makes cleanup way easier)
- A clean, well-lit workspace
- Masking tape (for labeling wires trust me on this)
Optional but nice to have: a helping-hands tool or clamp to hold things steady while you work. If you don't have one, a rolled-up towel works fine to prop up your guitar.
STEP 1: REMOVE YOUR STRINGS
First things first take off your strings. You don't need to remove all of them if you don't want to, but at minimum, loosen them enough to get them out of your way. This gives you room to work and keeps you from accidentally burning a string with your soldering iron.
Once the strings are off, wipe down your fretboard. You're already here might as well.
STEP 2: REMOVE THE PICKGUARD (OR CONTROL PLATE)
Now it's time to open things up. For most guitars, that means removing the pickguard.
Unscrew all the pickguard screws and set them aside somewhere you won't lose them. A small bowl or magnetic tray works great. Gently lift the pickguard away from the body. It might be stuck a little don't force it. Wiggle it gently until it comes free.
For guitars with a control plate instead of a full pickguard (like a Les Paul or Telecaster), remove the screws holding the plate in place and carefully pull it out. You'll see your existing electronics underneath.
STEP 3: TAKE A PHOTO (SERIOUSLY)
Before you touch a single wire, pull out your phone and take a photo. Actually, take a few. Get close-ups of how everything's connected where the pickup wires go, how the ground wire is attached, how the output jack is wired. This is your safety net. If you get lost halfway through, you'll have a reference.
You can also label wires with masking tape if that helps you keep track. Write things like "bridge pickup" or "neck hot" so you're not guessing later.
STEP 4: DESOLDER THE OLD ELECTRONICS
Time to disconnect the old stuff. Start with the output jack. It usually has two wires soldered to it one from the harness and one ground wire. Heat up each solder joint with your iron and gently pull the wire free once the solder melts. If it's stubborn, just cut the wire.
Next, desolder the pickup wires from the old harness. Heat the joint, remove the wire, and set it aside. Keep track of which wire came from which pickup.
If your guitar has a ground wire running from the bridge or tremolo cavity to the harness, desolder that too or cut it close to the original harness. It's usually soldered to the back of a pot.
STEP 5: REMOVE THE OLD HARNESS
Once everything's disconnected, the old harness should lift right out.
Set the old harness aside. You're not throwing it away yet it's your backup in case something goes sideways. Once you know the new harness works, you can toss it or keep it as a spare.
STEP 6: INSTALL THE NEW 920D HARNESS
Here's where it gets fun. Your 920D harness comes pre-wired, which means the pots, switch, and capacitor are already connected. All you need to do is drop it in and connect your pickups and output jack.
Start by fitting the pots into their holes in the pickguard. Push them through from the back, then secure them with the included nuts, leaving the black lock washer in between the pickguard and the pot. Tighten them just enough to hold everything in place don't crank them down.
If you're working with a pickguard, make sure the harness sits flat and the wires aren't getting pinched. Everything should have a little slack. If the wires are stretched tight, you risk breaking a connection down the line.
STEP 7: SOLDER THE PICKUPS
Now connect your pickups to the new harness. Your 920D harness will have labeled connection points or color-coded wires check the wiring diagram for your pickups to make sure you have the right colors.
Typically, each pickup has a hot wire and a ground wire. The hot wire usually goes to a specific lug on the switch or volume pot (your diagram will show you which one). The ground wire gets soldered to the back of a pot, where it joins the rest of the ground connections.
Here's how to make a clean solder joint: pull back a tiny bit of insulation off the wire if needed, and tin the wire by applying a small amount of solder to it. Then hold the wire against the connection point, heat both the wire and the pot/lug with your iron, and apply just enough solder to make a solid connection. It should look shiny and smooth, not blobby no need to press hard, just make sure the iron is touching both the wire and the pot/lug.
Don't hold the iron on the joint for too long a few seconds is enough. Overheating can damage components or lift solder pads.
STEP 8: CONNECT THE OUTPUT JACK
Your output jack needs two connections: the hot wire from your harness and the ground wire. Take a photo of the original wiring and de-solder the two points. and fish them through the body.
Solder these just like you did the pickups heat the lug, apply solder if needed, make sure the connection is solid. Give the wires a gentle tug after they cool to make sure they're secure.
STEP 9: REATTACH THE GROUND WIRE
If your guitar has a ground wire running to the bridge or tremolo cavity or the body, solder it to the back of one of the pots on your new harness. This is what keeps your guitar quiet and hum-free. Without it, you'll get buzz and noise especially with single-coils. if you have any shielding make sure to ground that to the top of a pot as well.
STEP 10: TEST BEFORE YOU CLOSE IT UP
Don't screw the pickguard back on yet. Plug in your guitar and turn on your amp. Tap each pickup with a screwdriver you should hear a signal through the amp. Flip the switch between pickup positions and make sure everything's working. Turn the volume and tone knobs to make sure they respond smoothly.
If something's not working, don't panic. Go back to your wiring diagram and double-check your connections. A cold solder joint or a wire in the wrong spot is usually the culprit. Reflow any joints that look sketchy and test again.
STEP 11: REASSEMBLE YOUR GUITAR
Once everything's working, it's time to button it up. Carefully lower the pickguard or control plate back into place. Make sure no wires are getting pinched or caught under the edge. Screw it down, but don't over tighten you'll crack the plastic or strip the screw holes.
STEP 12: RESTRING AND PLAY
Put your strings back on, tune up, and plug in. This is the moment you've been waiting for. Play some chords, hit some riffs, and feel the difference.
WHAT IF SOMETHING GOES WRONG?
If you're getting no sound at all, check your output jack connections first. A loose or broken wire there will kill your signal completely.
If one pickup isn't working, double-check the wiring for that pickup. Make sure the hot wire is soldered to the right lug on the switch and the ground wire is connected to the back of a pot.
If you're getting hum or noise, check your ground connections. Make sure the ground wire from the bridge is soldered securely and that all your ground wires are making good contact with the pot casings.
Still stuck? Reach out. We have seen it all and can walk you through troubleshooting.
FINAL THOUGHTS
Installing a wiring harness isn't as intimidating as it looks. It's a straightforward upgrade that makes a real difference in how your guitar sounds and feels. And once you've done it, you'll have the confidence to tackle other mods down the line pickup swaps, coil splits, phase switches, whatever you want.
Your guitar just got a serious upgrade. Now get out there and play it.