Turning relay on by ignition wire?
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=61118
Printed Date: May 10, 2025 at 6:59 AM
Topic: Turning relay on by ignition wire?
Posted By: kickercivic1
Subject: Turning relay on by ignition wire?
Date Posted: August 10, 2005 at 10:33 PM
I am trying to put a laptop in my car. I already bough a 12v adapter for car. I am trying to hardwire to my car using a realy. I want the charger to come on when the ignition is on. How would i wire it the relay??
Replies:
Posted By: hotwaterwizard
Date Posted: August 10, 2005 at 10:44 PM
Hook up the charger where the Lights are on this diagram. 
------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: Velocity Motors
Date Posted: August 10, 2005 at 10:59 PM
You don't really need a relay, just a fused wire on the (+) wire of the car charger running to a switch ignition wire off the ignition harness. Ground the (-) wire to the chassis and your good to go. The relay won't really help anything. ------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: kickercivic1
Date Posted: August 10, 2005 at 10:59 PM
85 is iginition wire, 30 is power wire straight from battery(+),86 is ground and 87 is (+) to laptop charger right??? HOw many amps does the 85 put out for the relay to kick on??? 85 is just used as switch right???
Posted By: hotwaterwizard
Date Posted: August 10, 2005 at 11:02 PM
85 is less than 1 amp
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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: kickercivic1
Date Posted: August 10, 2005 at 11:05 PM
Oh forgot to also ask.. I am also going to install whelen strobe power supply to run strobes in my car.. And i wan to run relay for it too because it draws alot of amps. Would i wire it the same way as above digram?? I wan to have a switch for it tho.
Posted By: hotwaterwizard
Date Posted: August 10, 2005 at 11:06 PM
The switch in the picture is your key switch. 85 is the coil and it will switch the relay on when the key is on. 30 and 87 are like a toggle switch and 85 is like your finger switching it on and off.
-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: kickercivic1
Date Posted: August 10, 2005 at 11:06 PM
hotwaterwizard wrote:
85 is less than 1 amp
After i hook it up can i check it with mulitmeter to see how much it is drawing?
Posted By: hotwaterwizard
Date Posted: August 10, 2005 at 11:08 PM
Fuse the hot lead for the amps that you will draw. yes same way. ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hotwaterwizard
Date Posted: August 10, 2005 at 11:09 PM
IM me at AIM or AOL Messanger if you like or my private chat room.
-------------
John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: kickercivic1
Date Posted: August 10, 2005 at 11:10 PM
Hi you are awesome man. Thank you for your quick help. I well let you know how everything works out tomorrow.
Posted By: hotwaterwizard
Date Posted: August 10, 2005 at 11:27 PM
Here is a Diagram of one of the relays in your project. 
------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: kickercivic1
Date Posted: August 16, 2005 at 2:25 PM
I have bosch relay it have 5 prongs (85,86,30,87,87a) I tried the digram on the first page and its don't work.
Posted By: hotwaterwizard
Date Posted: August 16, 2005 at 10:11 PM
Try this one! 
------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: kickercivic1
Date Posted: August 17, 2005 at 10:29 AM
Sorry about that. Everything works now..It was that my ING wire was not working. Now it all works thanx for the help.
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