- The following instructions are germane to toggle switch wiring ONLY!
- Endeavor to obtain a high-quality switch for this project. You want a double-pole, double-throw, center-off toggle switch, available at any decent hardware/electronic store for around $5-10.
- For each postion of the switch (top, center, and bottom), solder the two poles together for redundant reliability. (Shown as the thick black jumper lines in the above image).
- The center two poles are connected to the PHID relay(s) to serve as signal voltage.
- `One switched hot lead (12 volts present whenever the ignition key is on) goes to one of the double pole connections.
- The last double pole connection receives its source *directly* from the low beam source or high beam source, depending on your preference and/or local ordinances. Which way is best for you? It really depends on your state's Vehicle Code.
- Some states say aux lights must be used with low beams only (as in a fog conditions), many other states allow use of aux lights in conjunction with high beams only. So this last wire connection depends on which configuration your state laws require.
- The point is this: one of your switch settings should be "state-legal", so that if you are ever pulled over by the police, you can demonstrate your auxiliary light system is within legal state requirements. For the other toggle switch setting, I personally like to configure such that the PIAAs light off regardless of high beam/low beam settings.