Which relay do I need?

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=59003
Printed Date: July 12, 2025 at 3:20 PM

Topic: Which relay do I need?

Posted By: centrek
Subject: Which relay do I need?
Date Posted: July 07, 2005 at 2:12 PM

Here's what i'm doing...

I have 3 amps, all of which need +12v remote wire. I'm also running a computer, but i'm going to wire it in so that the key has to be on in order for the computer to run. Heck, i guess i'll make it so that the stereo has to be on for the computer to turn on. So I need a relay to run the remote wire from the stereo in to, and then out of the relay I need 1 +12v to each of the three amps, and 1 +12v to the computer. I no nothing about how much current you can pass through relays and that kind of stuff, But I think that a relay is the best bet for what i'm looking to do. I have a +12v distribution block with four outputs, they are all fused as well. The first three are for the three amps, and the 4th I plan to go to the relay, and then jump off from there to each of the three amps' remote and the computer power. Let me know how this sounds

If any of you could help me find the right relay and where to purchase it, it'd be much appreciated.

Thanks in advance,

matt

Replies:

Posted By: hotwaterwizard
Date Posted: July 07, 2005 at 9:24 PM

Just go down to the Autoparts Store and get a Fog Lamp Relay with the harness eor less than $10. It will do the Job just fine.

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

Posted By: maglin
Date Posted: July 07, 2005 at 10:05 PM

whered you get a power supply for the computer, or are you using a inverter.

~~Vinn

Posted By: maglin
Date Posted: July 07, 2005 at 10:05 PM

whered you get a power supply for the computer, or are you using a inverter.

~~Vinn

Posted By: hotwaterwizard
Date Posted: July 08, 2005 at 10:47 PM

Some Laptops have a 12v adaptor that just plugs in the Cigarette lighter like a Cell phone adaptor. It charges the Batteries.

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

Posted By: centrek
Date Posted: July 10, 2005 at 6:14 PM

great, thanks for the relay information...ill have to see how much my cost is on that relay at NAPA

anyways, about the computer: i'm not using a laptop, it's a mini-itx computer...VIA is the motherboard manufacturer...they are really slick little units, as small as 12cmx12cm tiny footprint. But you can get all kinds of different power supplies..OPUS makes 120 and 150w powersupplies with startup and shutdown controllers for these mini-itx computers.

check out www.mp3car.com lots of good information over there about setting your car up with a computer

thanks again guys

matt