Westone Thunder active guitar wiring

This diagram is based on the wiring in a mid-1983 Thunder IIA. I have compared that guitars wiring to the wiring in a 1984 Thunder IA - they were identical. This wiring diagram should be suitable for any Thunder active guitar with controls for volume, passive tone and active tone and 3 mini switches for coil tap, phase reverse, and active on/off


  1. the white wire from the neck pickup connects directly to the red wire on the shielded cable to the pickup switch. The join is wrapped in insulated sleeving
  2. there is a pcb on the back of the phase switch which provides the interconnections between the terminals. If the switch needs replaced the pcb is not needed and can be replaced by 2 link wires as shown
  3. this is a bare wire which connects to single terminals on the coil tap and phase switches and also is soldered to the bodies of all three mini switches
  4. this battery earth connects to the switch terminal on the (3 terminal) jack socket - the circuit is completed when a jack is inserted, connecting this terminal to earth. The 3 mini switches are all DPDT. The volume and tone pots are 500K log, the active tone pot is a 500K linear pot with a centre detent. The tone cap C1 is a 0.022 microfarad mylar capacitor. All the passive components on the PCB are easily available, should any need replaced  - the only active component is the IC, an LA6358 dual op-amp. These may  be difficult to obtain, and can be directly replaced if needed by an LM358.