relay for accessory

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=111203
Printed Date: July 29, 2025 at 12:51 AM

Topic: relay for accessory

Posted By: Matrix7333
Subject: relay for accessory
Date Posted: January 31, 2009 at 11:02 PM

Hello all,

I am installing a remote start/alarm system which has 1 accessory wire. My vehicle has three. How would I wire a relay to have all three accesory wire powered for remote operation?

Thanks

Replies:

Posted By: i am an idiot
Date Posted: February 01, 2009 at 3:59 AM

You may not need all 3 wires, if you find you do need all 3 the following will help you.

3 relays, terminal 87 of first relay to acc 1, 87 of second to acc 2, 87 of third relay to acc 3. The rest of this info pertains to all 3 of the relays. Ground terminal 85 of all 3 relays. Acc output from your alarm to 86 of each relay. Constant 12 volts to 30 on each relay.

Posted By: hotwaterwizard
Date Posted: February 01, 2009 at 12:12 PM

Use Diodes Tie inputs together and outputs to each one you want to trigger

input 1 -----I>I----- output 1

input 2 -----I>I----- output 2

input 3 -----I>I----- output 3

https://www.the12volt.com/diodes/diodes.asp

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

Posted By: Matrix7333
Date Posted: February 01, 2009 at 3:08 PM

Actually, heres my dilemna. I am installing a RS (autopage RS-1000) in my 2006 Escalade EXT. All the wire diagrams say there are 2 Ignition wires, 1 constant and 2 Accessory. I have probed all the wires and found 1 pink ignition 2 constant (1 red and 1 RED / white) and three accesory. (brown, orange and 1 whitish almost yellow). I had a RS installed before and my check engine light would come before and the only wire I was not powering up was this third accesory wire which is actually right beside the other two accessory wires.

I would lose power if I drove the vehicle unless I shutdown by remote and then started with the key. Thanks for the setup above as this took care of that.

Thanks

Posted By: Matrix7333
Date Posted: February 01, 2009 at 3:14 PM

are you saying to put a diode across each trigger from the RS to Relay, I hooked it all up before I saw your reply but can make changes if need be because I still have everthing open. I am just programming features now and trying to figure out how to diode isolate the four door triggers.

Thanks

Posted By: i am an idiot
Date Posted: February 01, 2009 at 3:48 PM

He was giving you an option without using the relays. If you were to do it without the relays you should use diodes larger than 1 amp diodes. If you used the relays and are having no problems with the setup, leave it as it is.

Posted By: Matrix7333
Date Posted: February 01, 2009 at 7:07 PM

ok, i thought it was unsafe to do so without relays. I have a lot of both at the house but prefer the relay method.

Thanks for all your help. It works and I love this Autopage RS-1000 compared to my CodeAlarm CA670.