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can a relay be used to cut power?


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Catfish45 
Member - Posts: 14
Member spacespace
Joined: January 10, 2004
Posted: May 18, 2014 at 11:58 PM / IP Logged  
I'm not sure if a relay is what I need, if not maybe someone can point me in the right direction. I need a way to have power run through a wire until ground is applied to a relay, switch, etc causing the power wire to lose Contact, killing power to the rest of the wire. Hopefully that makes sense. Thanks!
Catfish45 
Member - Posts: 14
Member spacespace
Joined: January 10, 2004
Posted: May 19, 2014 at 12:01 AM / IP Logged  
Oh this needs to be more of an automated process, when I say switch it can't be one that has to be thrown manually.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: May 19, 2014 at 12:42 AM / IP Logged  
Standard wiring using a 5 pin relay.
Ignition to 86, ground to 85 power in 87a, out 30.
86 must be ignition or ACC otherwise the relay will drain the battery.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: May 19, 2014 at 1:37 AM / IP Logged  
Or as I understand it, a self-latching relay as per here (9th post) where the "off switch" contact is 87a & 30 of a 5-pin/SPDT relay with 86 to +12V & 85 top your GND off switch.

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