Since the G-400 is no longer carried (or at least much harder to find) we linked instead to the Epiphone SG Standard. All other product links are accurate and up to date, as of December 10th. Also made minor changes to article formatting.
Quick Summary: In this build guide we take on an Epiphone G-400 SG, replacing the stock pickups and volume pots with Seymour Duncan Saturday Night Specials and 500k volume pots from StewMac.

For this upgrade we bought a brand new Epiphone G-400 SG (also works with the Epiphone SG Standard) which would be considered an okay budget guitar.
Mojo Tone Solderless Sg Wiring Harness
Our task was to replace a few components and make it into a much better-sounding, more capable instrument that could, perhaps, satisfy those who had surpassed the beginner stages.
Please note: We actually bought all of the parts that were used in this build guide, including the guitar itself. Here's a full list of what we had on hand for the pickup upgrade:
The Saturday Night Special pickup set from Seymour Duncan was the core of the upgrade, adding a more classic-voiced tone with Alnico magnets and a warmer EQ profile, yet with plenty of treble on the high end.
Wiring Harness For Gibson Sg Pro
Note that in the diagram, the Seymour Duncan-branded volume pots are just placeholders and will be different if you use the existing Epiphone pots or the Alpha pots like we put on. In this guitar configuration there is a volume and tone knob for each pickup.
Just to get a feel for how these upgrades transformed the tone of the guitar, here are a few sound clips from before we made any changes to the Epiphone SG. This is what it sounded like straight out of the box, with nothing but a quick tuning.
Now that you've heard the difference in tone, let's go quickly through the modding process and show you how we installed the parts and what tools were needed to do so.
Les Paul Jr. Prebuilt Wiring Upgrade Kit With Orange Drop Tone Caps
While this process is always subject to change, depending on parts, we can go through a generalized step-by-step retelling of how we installed each piece. Before doing an upgrade like this, it's necessary to have the following tools on hand:
While not crucial, we also found that having a multimeter around to test soldered wire connections was pretty helpful, especially when putting on the new volume knobs and trying to figure out the wiring.
The first thing we did was remove the strings, volume knobs and the existing Epiphone pickups. We used blue tape to keep the volume pots from falling back into the body of the guitar (this was before we put in the new volume pots).
Gibson) Sg Wiring Harness, Treble Bleed, No Load Tone, 50's Or Modern Wiring
Old pickups and volume knobs come out first, making room for the Seymour Duncan Saturday Night Specials (the one sitting in the bridge position).
Once that was done, we were able to wire the new Seymour Duncan pickups through the bridge and neck guitar positions. Note that the ends of the wires are wrapped together, so you'll need to unwrap these and strip all the smaller wires.

We bought replacement tone and volume pots from StewMac (to make sure the coil tapping would work correctly) but only ended up using the volume pots.
Wiring Harness For Epiphone Lp,sg,es 335 & Dot
Notice the six metal pins coming off of each new volume pot. These are much stronger soldering points than the plastic rings on the old stock volume pots that came with the guitar. Upgrading these was a necessary, yet affordable way to upgrade the quality of the guitar.
The specifics of wiring the pickups to these or other volume pots will depend largely on the type of configuration you want and weather or not you want to use coil tapping. We were able to follow the provided wiring diagram by Seymour Duncan and get both pickups working with the coil tapping functionality intact. Positioning of the small black wire and the main lines coming off the tone pots should be consistent.
Wiring will depend on how you want to configure the Seymour Duncans and whether or not you want to use coil tapping.
Gibson Sb300 And Sb400 Wiring Diagram And Photos >> Flyguitars
Once all the wires were in place, we tucked everything into the back of the guitar and set the volume pots in place using the provided screws to hold them to the body and put the two volume knobs back on.
After that, the last task was to put on the Elixir strings and try it out. The pickups sounded and worked great (refer to the after sound samples from earlier in the article) and the improvement in tone was significant.

As mentioned, the wiring can be the trickiest part, which is difficult to speak to without knowing the particulars of your upgrade. If you're following along with the products we bought, use the Seymour Duncan guide that comes with the pickup set and make sure you follow the coil tapping configuration.
Toneshaper Wiring Kit, Gibson Es 335
If you have trouble, use a multimeter to test for connectivity in each wire and make sure that your soldering is thorough.
Otherwise, if you have questions about the process, the electronics involved or the parts recommended, feel free to get in touch via the comments section below.
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Sg Style Guitar Wiring Kit (boutique Set)
Probably the biggest thing to keep in mind when swapping pickups is that not all manufacturers use the same color coding scheme for 4 wire pickups. Here's a decent chart I found:
Did the bridge tone control stop doing anything or the bridge pickup? Either way, if it was working previously, it'll likely come down to either a mistake in how things were wired or the pot / capacitor got too hot and was cooked. Go back through all the wiring connection changes you made and ensure they are soldered nicely.

Biddlin said: Welcome. *When i got the guitar....all eletronics were working fine. That seems to work with my 57s View attachment 39070 View attachment 39071 Best of luck. Click to expand...
Where Can I Find A Wiring Diagram For This Epiphone Sg With Emg Pick Ups
Minethulhu said: Probably the biggest thing to keep in mind when swapping pickups is that not all manufacturers use the same color coding scheme for 4 wire pickups. Here's a decent chart I found: http://www.proaudioland.com/wp/wp-content/uploads/2014/06/color_codes.jpg I'm guessing that will explain the wiring issue with the neck pickup. Did the bridge tone control stop doing anything or the bridge pickup? Either way, if it was working previously, it'll likely come down to either a mistake in how things were wired or the pot / capacitor got too hot and was cooked. Go back through all the wiring connection changes you made and ensure they are soldered nicely. If it still doesn't work, posting pictures of the wiring might help... Click to expand... Yes yes....i know.
Bruno said: Thank you! Still...nothing. Both pickups are only working when they're connected to the middle lug. No tone control...(i guess no volume either) I did...re did....and re re did all the wiring...nothing. Click to expand... Did you replace the pots in your re re re doing it all ? If not it sounds like you might have fried someof them.
DrBGood said: Did you replace the pots in your re re re doing it all ? If not it sounds like you might have fried someof them. Click to expand... Dead on!
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