Diagram for 2 Devices with 1 Switch

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=138858
Printed Date: April 19, 2024 at 8:17 AM

Topic: Diagram for 2 Devices with 1 Switch

Posted By: wiker man
Subject: Diagram for 2 Devices with 1 Switch
Date Posted: April 23, 2015 at 6:46 AM

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.

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Replies:

Posted By: howie ll
Date Posted: April 23, 2015 at 10:45 AM

Power to each then use a SPCO (Single Pole Change Over) switch to switch the ground side.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Posted By: wiker man
Date Posted: April 23, 2015 at 3:57 PM

will you draw me a diagram please ? and can it be done with relays?

Posted By: wiker man
Date Posted: April 23, 2015 at 3:58 PM

I actually have a spesific on off switch which is on/off only, not SPCO and I rather use that. thanks.

Posted By: the12volt
Date Posted: April 23, 2015 at 4:48 PM

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.

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Posted By: hotwaterwizard
Date Posted: April 25, 2015 at 10:38 PM

Here you go! posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: howie ll
Date Posted: April 26, 2015 at 4:18 AM

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.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Posted By: hotwaterwizard
Date Posted: April 26, 2015 at 8:20 PM

True we don't know the application. I read the post several times to come up with this solution.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: howie ll
Date Posted: April 27, 2015 at 3:07 AM

Yes, let's hope the 12V+ source is ignition switched.

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Posted By: hotwaterwizard
Date Posted: April 27, 2015 at 9:24 PM

switched and fused.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: howie ll
Date Posted: April 28, 2015 at 2:06 AM

My bad!

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Posted By: hotwaterwizard
Date Posted: April 29, 2015 at 7:21 PM

Looks like someone deleted my last post on this subject???? posted_image

Wish this guy would respond to our solution>

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: howie ll
Date Posted: April 30, 2015 at 2:07 AM

And mine.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.