My track car has a deleted HVAC panel that I have set up with 30a toggle switches for various functions. Instead of mounting the stock defroster and hazard switches on that panel, I would like to keep it cleaner and wire them both to toggle switches. Being as though the defroster is fused @ 30a, and the hazard at 15a, I think I am going to use a relay for both of them.
The defroster switch seems like a pretty similar in/out design.
However, the hazard is a little more complex. I don't care if my toggle switch flashes in any way shape or form. The thing that confuses me is that the hazard has both a constant 12v AND a switched 12v input. The constant 12v makes sense since the hazards will work without the key in the ignition. However, why would you also need/want a switch 12v input to the hazards as well? There is only one output wire. Will the switch still work if I use either/or the constant or switched power?
Here is a link to the ETM: http://wedophones.com/Manuals/BMW/19...g%20Manual.pdf
The defroster is on page 62. My plan would be to cut the 2.5 gn/bu input power and make that the powered feed on the relay. Then cut the 2.5 bk and make the output of the relay. The toggle switch would be powered by simple 12v switched and would be the trigger for the relay.
The hazard is on page 76. As you can see it has both a 1.5 vi/gy switched 12v (fuse 4) and 1.5 rd/wt (fuse 24) input. The output is only one wire, the 1.5 gn/vi that goes to the flasher module. If I wired only the switched 12v to the input of a relay, would the hazards still flash? They both seem to be on the same switch.
The input switch is tied to several other switches for the illumination. Would any of those cause an issue with the flashers functioning when I bypass the base?
I only have a basic understanding of electrical diagrams. Any insight would be appreciated! Here is a pic of my interior and switch panel for attention.
The defroster switch seems like a pretty similar in/out design.
However, the hazard is a little more complex. I don't care if my toggle switch flashes in any way shape or form. The thing that confuses me is that the hazard has both a constant 12v AND a switched 12v input. The constant 12v makes sense since the hazards will work without the key in the ignition. However, why would you also need/want a switch 12v input to the hazards as well? There is only one output wire. Will the switch still work if I use either/or the constant or switched power?
Here is a link to the ETM: http://wedophones.com/Manuals/BMW/19...g%20Manual.pdf
The defroster is on page 62. My plan would be to cut the 2.5 gn/bu input power and make that the powered feed on the relay. Then cut the 2.5 bk and make the output of the relay. The toggle switch would be powered by simple 12v switched and would be the trigger for the relay.
The hazard is on page 76. As you can see it has both a 1.5 vi/gy switched 12v (fuse 4) and 1.5 rd/wt (fuse 24) input. The output is only one wire, the 1.5 gn/vi that goes to the flasher module. If I wired only the switched 12v to the input of a relay, would the hazards still flash? They both seem to be on the same switch.
The input switch is tied to several other switches for the illumination. Would any of those cause an issue with the flashers functioning when I bypass the base?
I only have a basic understanding of electrical diagrams. Any insight would be appreciated! Here is a pic of my interior and switch panel for attention.
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