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Diagram for 2 Devices with 1 Switch


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wiker man 
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Posted: April 23, 2015 at 6:46 AM / IP Logged  
Hi, I need some help with this simple thing I am trying to do but too worked up to figure out myself. I am going to be using a simple on off switch, 12V. When on, it will complete a circuit / provide 12V to a device which will activate. But at the same time I am wanting to hook another device to it, which as soon as its pressed on will turn off.
So when Switch is On. #1 Device is On and #2 Device is Off, and when Switch is off, I want #1 Device to Turn off while #2 Device turns on.
Diagram for 2 Devices with 1 Switch -- posted image.
howie ll 
Pot Metal - Posts: 16,466
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Posted: April 23, 2015 at 10:45 AM / IP Logged  
Power to each then use a SPCO (Single Pole Change Over) switch to switch the ground side.
wiker man 
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Posted: April 23, 2015 at 3:57 PM / IP Logged  
will you draw me a diagram please ? and can it be done with relays?
wiker man 
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Joined: December 22, 2013
Posted: April 23, 2015 at 3:58 PM / IP Logged  
I actually have a spesific on off switch which is on/off only, not SPCO and I rather use that. thanks.
the12volt 
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Posted: April 23, 2015 at 4:48 PM / IP Logged  
One side of switch to ground.
Other side of switch to terminal 86 of an SPDT relay.
Fused 12V+ to terminals 85 and 30 of SPDT relay.
Terminal 87 of SPDT relay to device 1 power.
Terminal 87a of SPDT relay to device 2 power.
Both device grounds to ground.
Diagram for 2 Devices with 1 Switch -- posted image. the12volt • Support the12volt.com
hotwaterwizard 
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Posted: April 25, 2015 at 10:38 PM / IP Logged  
Here you go!Diagram for 2 Devices with 1 Switch -- posted image.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
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Location: United Kingdom
Posted: April 26, 2015 at 4:18 AM / IP Logged  
Cynical me would like to question both of the above answers in light of the fact that we didn't inquire the purpose of the circuit, is it in an auto and therefore will one circuit be on all of the time? That's why I recommended a centre off switch.
hotwaterwizard 
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Posted: April 26, 2015 at 8:20 PM / IP Logged  
True we don't know the application. I read the post several times to come up with this solution.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: April 27, 2015 at 3:07 AM / IP Logged  
Yes, let's hope the 12V+ source is ignition switched.
hotwaterwizard 
Silver - Posts: 1,350
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Joined: December 11, 2003
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Posted: April 27, 2015 at 9:24 PM / IP Logged  
switched and fused.
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
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