Adding more DC outlets and an LED

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Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=141442
Printed Date: May 01, 2025 at 1:03 PM

Topic: Adding more DC outlets and an LED

Posted By: outbackken
Subject: Adding more DC outlets and an LED
Date Posted: June 27, 2016 at 7:07 PM

I would like to add some more DC outlets to my Subaru Crosstrek along with a LED light in the cubbie bin. I purchased a Painless Wireing fuse block to keep all this stuff separate from existing fuses to keep it clean and avoid additional problems.
A couple of questions I have is; should I use a DPST relay? do I need resisters and if so which kind? and is everything else in my diagram sound and safe?

My small led is one from adafruit (https://www.adafruit.com/products/1476) The button is just for illumination. It will not control anything.

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Replies:

Posted By: i am an idiot
Date Posted: June 27, 2016 at 10:02 PM

Did not read or study your diagram, but yes you do need a resistor in series with the 3 volt LED. 1000 ohm 1/4 watt will be safe with just about any LED out there.

Posted By: outbackken
Date Posted: June 28, 2016 at 5:21 AM

Ok. I updated the diagram to reflect that now.
I want to have the three elements in the rear cluster controlled by the one switch. This is the reason I think I need a DPST relay.

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Posted By: i am an idiot
Date Posted: June 28, 2016 at 11:27 AM

1K ohm 1/4 watt. You do not need a 100 watt device.

Posted By: outbackken
Date Posted: July 03, 2016 at 2:21 PM

Is this a less convoluted diagram to get my results? It is my understanding that by adding resister I would be creating a heating issue so if I can avoid that, it would be better.

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