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You could use a latching relay like the one shown below or you could use SPDT relays to accomplish this. The latching relay below only requires that the coil be momentarily energized to set and reset or to keep the two terminals closed or opened even after the coil is no longer energized. If you are using two different switches and they are both negative or both positive, you'll need to diode isolate each and connect them to one side of the coil of the relay. If one is positive and one is negative, you'll have to add an SPDT relay to change one of them so both are the same or you can use an SPDT relay on each of them and no diodes would be necessary. If you want to use just SPDT relays, let me know what the outputs of each switch are and I'll draw you a diagram of an interrupt operated by two separate pulses.
the12volt • Support the12volt.comI think I understand what you want to do, but just to be sure... Do you want to power the accessory lead on and off with two separate pulses or outputs? Or would you prefer to use the same output from your alarm to power the accessory lead on and off as well as the ability to turn it off with the output of your switch?
the12volt • Support the12volt.comThis will provide you with a 12V+ output that will stay on with just a momentary negative output from your alarm. The negative output from your switch will turn it off.
This next one will also provide you with a 12V+ output that will stay on with just a momentary negative output from your alarm. The same negative output from your alarm will turn off the 12V+ output. The negative output from your switch (or a negative from another output of your alarm) shown at the top of the diagram will also turn off the 12V+ output.
the12volt • Support the12volt.comYes, the third relay is the latch and maintains power until you interrupt ground to it's coil via the second relay. The first relay is only needed to engage the latch. You could use a positive alarm output to engage the latch, but will need a diode to prevent 12V+ from feeding back into the alarm output and any other devices that may also be triggered by it.
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