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How to create ground while disarmed?


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timmerk 
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Posted: May 08, 2016 at 11:40 PM / IP Logged Link to Post Post Reply Quote timmerk
Hello,
I saw this thread: https://www.the12volt.com/installbay/forum_posts.asp?tid=140965 which inspired me to ask a similar question: is there a way to create a continuous ground while disarmed output using the negative unlock output pulse from a DEI 2102T PKE? Ideally the relay setup wouldn't be energized while the car is off/armed.
Thanks!
howie ll 
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Posted: May 09, 2016 at 1:27 AM / IP Logged Link to Post Post Reply Quote howie ll
Use a dual coil latching relay from Omron works off lock and unlock. No current draw that way.
i am an idiot 
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Posted: May 09, 2016 at 8:01 PM / IP Logged Link to Post Post Reply Quote i am an idiot
What kind of current capacity do you need? If it is to drive an LED wire positive wire to constant 12 volts. Ground the LED to an Ignition wire. Ignition off there will be enough of a ground to illuminate an LED.
timmerk 
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Posted: May 11, 2016 at 11:28 PM / IP Logged Link to Post Post Reply Quote timmerk
Thanks guys. The dual coil latching relay looks perfect.
As for the current, I think < 1amp. It's to enable a push to start module. I was thinking maybe I could just use a normal relay and connect it to the starter kill output? Wouldn't this inverse the signal, so that when the car is disarmed, a constant ground would be output for use with the push to start module?
Thanks again
howie ll 
Pot Metal - Posts: 16,466
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Posted: May 15, 2016 at 12:00 AM / IP Logged Link to Post Post Reply Quote howie ll
Show me a diagram of what you're suggesting.
timmerk 
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Posted: August 02, 2016 at 10:15 PM / IP Logged Link to Post Post Reply Quote timmerk
Actually, it looks like the "Starter Kill Output" on the PKE is ground while armed (correct me if I'm mistaken), according to this diagram:
How to create ground while disarmed? -- posted image.
So, wouldn't I just need a normal SPDT/SPST relay to reverse it so I could have ground while disarmed? Or would this route require the relay to be energized the whole time it's armed?
howie ll 
Pot Metal - Posts: 16,466
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Posted: August 03, 2016 at 8:37 AM / IP Logged Link to Post Post Reply Quote howie ll
Why don't you test and see but yes I think the wire going to the coil 85 of the relay looks NEG tome, tap that but diode block, i.e. inline diodes, 1N4004,bands towards unit.

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