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question on relay use


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DaveK 
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Posted: July 02, 2004 at 10:33 AM / IP Logged  
I have a question on the diagram for the auto unlock w/o alarm diagram.
question on relay use - Last Post -- posted image.
Why is the coil connected to +12V on both sides?
Thanks for any help.
xetmes 
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Joined: May 18, 2003
Posted: July 02, 2004 at 1:47 PM / IP Logged  

the coil is not connected to +12 on both sides all the time

the fused +12 is always +12

then the ignition is on the cap discharges (no voltage across it)

then the vehicle is shut off, the cap draw a good deal of current (displacement current) to charge the cap, this triggers the relay on, after the cap is fully charged the current stops flowing.

this causes a momentary pulse that turns the relay on for a short period of time... this then triggers the door lock actuators

DaveK 
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Posted: July 06, 2004 at 2:10 PM / IP Logged  
I need to wire this in series with the +12v from the battery to the ignition switch or is the ignition +12V in the diagram actually +12V from the ignition switch?
Sorry to be difficult. I'm just having a hard time visualizing this application.
xetmes 
Silver - Posts: 586
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Posted: July 06, 2004 at 9:00 PM / IP Logged  
no not in series, branch off the +12V ign to the ignition input in that diagram
DaveK 
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Joined: November 08, 2002
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Posted: July 07, 2004 at 12:42 PM / IP Logged  
But wouldn't the diode on the ignition wire prevent any current from flowing from the ignition switch?
xetmes 
Silver - Posts: 586
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Posted: July 07, 2004 at 4:00 PM / IP Logged  
yes, while the ignition is on, that keeps the relay off until the vehicle is shut off...
MattL 
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Posted: September 04, 2004 at 4:15 PM / IP Logged  
Sorry so the diagram above is unlock the doors when i switch the ignition off??
Is there a diagram for locking the doors when ignition on?
I dont want to invest in an alarm, i have some good quality relays lying around anyway.
Thanks
Matt
DaveK 
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Joined: November 08, 2002
Location: United States
Posted: September 05, 2004 at 3:54 PM / IP Logged  
https://www.the12volt.com/doorlocks/page3.asp

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