Dash Auxiliary Power Button

I have a better way of hooking up my dash auxiliary power button as right now the way I have it is a bit daffy and I'll explain why; The scenario works but what happens is that say I have the auxiliary power button turned on and I forget that it is on and then I turn over the cars ignition, well when I turn off the ignition key the car will keep running because power is still being supplied through the lower consoles auxiliary dash power button being turned on, I would then need to switch that off in order to turn the car off. This way is much better because that can't happen as the dash can only get it's power from one source or the other via the relay and not both at the same time which is how I currently have it wired.

2 Low Input to 2 Higher Output Relay Board

I did up a quick diagram of the little PCB board I made with some great help from Andrea lannaccone from Face Book. There are smaller ways to do this but this is pretty small too, you can do this type of switching with a Transistor too. For what I am doing with my Top Countdown Indicator lights to activate the switch lights on my Lower Console I only need one side of the board but there was room on the board to have the same ability twice so at least I have an extra setup for should I need to do something similar again. :) 

PCB Board Installed

I installed the small PCB board later today just overtop of the other Relays board I had made a few weeks ago. I have the power wire (blue) going from the fuse panel I installed under the passenger side Hush panel into the magnetic coil and switch terminal of one of the mini Songo 12V 10 Amp Relays, this will supply power to energize the coil and provide power to one side of the Relay switch. The other blue wire you can see coming out of the top of the Relay is the 2nd power wire on the other Relay switch terminal, this wire goes into my Lower Console to supply power to the switch lights. The Relays switch will connect the two completing the circuit. The two input wires Red and Black that connect to the Optocoupler I have going into a couple of spare sockets I had available on my Molex connector for my LCD and GPS screens. Those will provide the low input signal to activate the Optocoupler once the Countdown indicator reaches it's last light, this will in turn activate the Relay making the connection as described before. Tomorrow will be the big day I test this out so if all goes well I'll be doing a video to demonstrate the final effect.

Parking and Headlights Lower Console Auxiliary Switch Wiring

I have been collaborating with Lambros Vassiliou on Face Book on a wiring diagram for hooking up an auxiliary switch to activate the Parking and Headlights using one of the lower console's SPDT lighted white rocker switches. According to Lambros this diagram should work for wiring up the Headlights switch using this method on the 1982 Trans Am. I'm not sure about later models, I think it may depend on how the switch is wired so you will need to do some checking on that. Now I have not tested this wiring scheme yet. The Diodes that will be used are the 1N4007 Rectifier type (top right), 
the Relays can be SPST or SPDT rated at 20 to 30 Amps, I have a couple of SPST 40 Amp relays so I'll be using those (right).

I think I have everything I need to give this a shot, I need to pick up some more solder and I'm not sure if I want to mount my Diodes onto a small piece of PCB board or just do them as "in-line" Diodes. But it looks like I should be pretty close to doing a video to show how this works. From what I can see of the wiring diagram it looks like it would be easy to even use one of the Upper Console DPDT lighted rockers for the Parking and Headlights too. ;)


Just to clarify, this is what the plug on my Parking/Headlights combo switch looks like. As you can see it has an Orange, Yellow, Brown, White and what looks to be a fat 14 AWG Red wire on it. Now in the diagram above there is nothing happening with the White wire so I'm still trying to get a straight answer on what if anything happens with that wire??

NOTE: 

OK after some Multimeter testing on the stock OEM switch I had kicking around from the parts car it would appear that in the "OFF" position that there is a continuity between the White and Orange wire. Based on those findings I am going to try this diagram suggested by Mark Rolfe out as it seems to make the most sense with the white wire included into the scenario.

Since the white wire obviously has an internal connection on the stock switch in "OFF" position, the first SPDT Relay makes sense as in off position the white wire would be connected to the Red wire (You could use either Orange or Red as both are 12V). I'll be able to test this out when I have a SPDT Relay, right now I just have 2 SPST Relays and I need the one with the extra 87A pin for the White wire.