prelude1980
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| posted on 31/5/07 at 06:07 PM |
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Electrical Boffins needed
i need to find a way to switch a relay on and off, sounds simple but i don't know how to do it.
Basically i'm gonna have 1 wire which will need to turn power on and then keep it on, then a second wire that will turn on that will need to cut
the power.
If this makes sense your advice is appreciated
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flak monkey
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| posted on 31/5/07 at 06:08 PM |
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Strange application, what are you trying to do?
Sera
http://www.motosera.com
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prelude1980
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| posted on 31/5/07 at 06:10 PM |
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basically i have a motorbike alarm/immobiliser with a remote start. i was going to ditch the key to start and drive the car purely with the alarm fob
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flak monkey
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| posted on 31/5/07 at 06:17 PM |
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Ahh, so you want the starter to stop turning once the engines started? But you still need power to the ignition system...
Sure someone will come up with an electrical solution for you. Mine would be use the key 
Sera
http://www.motosera.com
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prelude1980
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| posted on 31/5/07 at 06:23 PM |
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ah no the alarm takes care of stopping the starter motor, i'm looking for something to stop the engine itself.
The alarm has an output wire to stop the engine but it needs to stop all power in the car
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darrens
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| posted on 31/5/07 at 07:05 PM |
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you'll need two relays, first one switched N.O and the second N.C and will open when you what to switch off the engine.
That's if I catch your drift!
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omega 24 v6
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| posted on 31/5/07 at 07:07 PM |
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2 relays would do it I think but a couple of questions
quote:
Basically i'm gonna have 1 wire which will need to turn power on and then keep it on, then a second wire that will turn on that will need to cut
the power.
The first wire is it live all the time?? does it need to go to the load at all times while the engine is running.
the second wire is it live as long as it's switched on?? is it momentary??
Mmmm Darrens is a quicker typist than me
[Edited on 31/5/07 by omega 24 v6]
If it looks wrong it probably is wrong.
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prelude1980
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| posted on 31/5/07 at 07:14 PM |
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quote:
Originally posted by omega 24 v6
2 relays would do it I think but a couple of questions
quote:
Basically i'm gonna have 1 wire which will need to turn power on and then keep it on, then a second wire that will turn on that will need to cut
the power.
The first wire is it live all the time?? does it need to go to the load at all times while the engine is running.
the second wire is it live as long as it's switched on?? is it momentary??
Thats a good question, i don't know for either of them, looking at the diagram i think the 1st wire is live all the time, the second wire i have
no idea, i think i need to test it out to see what happens
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omega 24 v6
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| posted on 31/5/07 at 07:16 PM |
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If you explain in detail what needs to happen and let us discuss/think about it. 2 guys coming up with the same idea is a good sign
Can you post the diagram??
[Edited on 31/5/07 by omega 24 v6]
If it looks wrong it probably is wrong.
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prelude1980
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| posted on 31/5/07 at 07:24 PM |
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basically i'm going to use an alarm fob to start my engine, the fob has a remote start option on it and i want to use this instead of the key to
start it.
from the black box i get a starting wire and a kill wire.
i don't have the diagram it's at work but will post tomo
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lsdweb
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| posted on 31/5/07 at 08:29 PM |
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quote:
from the black box i get a starting wire and a kill wire.
Are these 12v positive or switched earths (doesn't make a lot of difference to the solution really)
Like others have said, you'd need two relays, one for the ignition side of things and another for the starter solenoid. I doubt it, but maybe
the alarm provides enough current to power the solenoid on its own so no need for this second relay.
Wyn
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EVs
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| posted on 4/6/07 at 09:50 AM |
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You can make a latching relay out of two normal car relays.
The first relay is activated by your start signal, through a diode.
relay 1 CO gets +12V always
NO is wired to relay 2 CO
relay 2 NC goes to relay 1 coil +
Relay 2 is worked by your kill switch.
The starter is worked from the start signal from before the diode (a 3rd relay might be needed to work the starter)
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