I have a 12 volt basic car alarm. It has 2 negative pulse outputs to operate door locks....lock/unlock. I use this alarm on my garage, works great. I would like to use the lock/unlock pulses to power a 12 volt latching relay, which would allow me to use the contacts to power a 120 volt light on the garage. So when I turn the alarm on, the outdoor 120 volt light comes on. When I tun the alarm off, the 120v light goes off. Do I only need one latching relay or two? (lock/unlock) Also, will I need an additional 12 volt relay to turn on the 120 volt circuit, or will the latching relay be enough. I am having a hard time picturing the schematic. I think an automotive style spdt latching relay will work, and they are cheap. I also don't understand the terminal numbers represent...such as 85, 86, 87, 87a, etc. Can you help?
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