I have been faffing with the aux plug wiring for a while. There are a couple of issues:
- I was sent a hazard warning light switch for the aux panel when the Ford wiring is designed to use the switch on top of the steering column. I didn't realise until I had already fitted the switch to the aux panel.
- I was inspired by
Richard Lincoln and want the Savage switches to illuminate with the side lights.
Once I had the plug wiring set up for the hazard lights switch, I set about modifying it to include wiring for the LEDs. Here's the schematic I ended up with:
It is simple in principle: there is a 5K6 resistor from aux plug pin 1 (side lights) to the +ve terminal on the LED along with gratuitous use of diodes to stop the current flowing back where it shouldn't go. The diodes are orientated so that current can only flow INTO the LED +ve terminal. The net result is that the LEDs illuminate dimly with side lights on. Then:
- The horn switch LED remains dim regardless of what's happening.
- The fog light switch is dim with the fog light off or bright with it on - the fog light feed comes from the dipped headlight signal, so only works when the headlights are switched on.
- The hazard light switch now flashes bright / off with the side lights off or bright / dim with the side lights on.
Overall, it looks great and now I'm happy.