With its single pickup, one cannot expect the wiring harness of the SC-1 to be too complicated. As seen on this 1982 SC-1 w/DFV and 1983 SC-1, the harness is identical to the 1st style SB-1: a CTS 250kΩ Audio Taper potentiometer with a 20pF treble bleed capacitor as the volume control and CTS 250kΩ Audio Taper pot as the (treble cut) tone control with a 1,000pF (.001µF) bypass cap from signal lug straight to ground while the pot is in series with a 47,000pF (.047µF) cap from the wiper to ground.

Even though it has a second Jumbo MFD pickup, the wiring harness on this 1982 1st style SC-2 is identical to both SC-1s discussed above: similar CTS 250kΩ Audio Taper pots with a 20pF treble bleed cap on the volume pot and the 1,000pF (.001µF) bypass cap on the tone pot and the 47,000pF (.047µF) cap from the wiper to ground. But things have changed on this 1984 1st style SC-2 w/DFV: the value for the cap on the tone pot from the wiper to ground is 22,000pF (.022µF) instead. Moving to this 2nd style SC-2, also from 1984(!), the value for the treble bleed cap on the volume pot is now 200pF, with all other components being identical. This picture in the Guitars by Leo Gallery shows a modern wiring harness as used on the SC-2 (reissue) between 2008 and 2017, no longer showing the 1,000pF (.001µF) bypass cap on the tone pot; it is hard to make out the value for the cap on the volume pot.

The SC-3 has 3 single-coil MFD pickups with a slightly different geometry. This 1st style SC-3 w/DFV from 1984 has the identical wiring harness as the 1st style SC-2 w/DFV as discussed above. As with the 2nd style SC-2, the 2nd style SC-3, also built in 1984, utilized a 200pF treble bleed cap on the volume pot too. Strangely enough, on this 1987 2nd style SC-3 w/ebony fingerboard as well as this 1988 3rd style SC-3, a 20pF cap is used again, with all other components being identical. So is the use of the 200pF treble bleed cap an aberration typical for the latter half of 1984? Apparently not, because this 1991 SC-3 Deluxe, with the final version of this harness, clearly has a 200pF cap on its volume pot.

Interestingly enough, the same difference in the value of the volume control treble bleed cap is observed between a 1983 HG-2 prototype w/DFV and a production HG-2 from 1984. The former has a 20pF cap on the 250kΩ Audio Taper pot, the latter 200pF. On both guitars, the 250kΩ Audio Taper tone pot is in series with a 22,000pF (.022µF) cap from the wiper to ground. On the prototype, a 1,000pF cap is soldered in parallel to that cap resulting to the pot being in series with effectively a 23,000pF (.023µF) cap. The 1,000pF (.001µF) cap on the production model however is a true bypass cap from the signal lug straight to ground just like on the SC-1, demonstrating G&L used the same wiring harness at any time on entry level guitars, idiosyncrasies and all.