relay set up?
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=119824
Printed Date: June 09, 2024 at 10:46 AM
Topic: relay set up?
Posted By: ic3laxer
Subject: relay set up?
Date Posted: February 02, 2010 at 2:11 AM
So my friend gave me his used compustar p2wss and im working out the entire install to make sure I do it right. his was installed in a 05 sti and my car is an 03 civic. These forums have been a ton of help so far! Ok so the guy that installed it in his car used a relay with the output to starter kill in spot 85 the 12v constant in spot 86 and in spot 87a he has the output to starter and another wire comming out of it that i suspect he attahed to the wire coming from ignition switch also in in spot 30 he has another wire coming out that should also be attached my guess to starter motor? if anyone that understands relays better than me could look at this and just tell me if it makes any sense and if I have the connections right it would be very helpful. also with this setup do I cut the ignition wire and attach 87a from ignition and the other way toward starter motor to 30 or do i just tap the 87a into the ignition wire and 30 into my starter wire? any help is greatly appreciated!
Replies:
Posted By: oldspark
Date Posted: February 02, 2010 at 3:51 AM
No it seems ok to me assuming that his relay to starter kill 85 grounds the connection since the other end 86 goes to 12v constant. The 30 and 87a are to the starter motor solenoid or relay from the ignition switch's start position. Do not cut your ignition circuit to connect to this circuit because the starter and ignition are two separate circuits but if you mean to use another relay wired the same way that's okay. But make sure it is worth it because those systems are so easy to bypass on old cars if the ignition +12v side of the ignition switch is all connected together.
Posted By: ic3laxer
Date Posted: February 02, 2010 at 12:59 PM
ok thanks a ton! so just to make sure i understand this all I have to do is connect the wire comming out of 87a to my ignition wire and the wire comming out of 30 to my starter wire or is it the other way around?
Posted By: oldspark
Date Posted: February 02, 2010 at 5:58 PM
contact-wise it doesn't matter unless you used 87 as well as 87a but make sure you are not confusing ignition +12v (IGN) with the starter circuit which might be different ie usually turning on the ignition is one switch or relay but cranking the starter is another switch or relay although it will get its power from the ignition switch/relay that was all i meant sorry but i am not familiar with the details of that system but that is where the real experts here at 12volt are lifesavers.
Posted By: ic3laxer
Date Posted: February 03, 2010 at 12:21 AM
ok im sorry I messed up on my origilal post because there are two red wires and I messed them up, the relay has the output to ignition in spot 86 so it goes like this 86: output to ignition 85: output to starter kill 87a: output to starter and an etxra wire attached to nothing 30: extra wire attached to nothing so now that I have my wires straight does this make sense and if so where do I need to attach the extra wires comming out of 87a and 30?
Posted By: howie ll
Date Posted: February 03, 2010 at 3:54 AM
Forget all above the both of you are confusing me! This is how it should be wired. Ground when armed of Compustar 85
12V+ on ignition (BLACK / YELLOW) 86
Key side starter (BLACK/ white) 87a
Starter side of starter (BLACK/ white) 30
Starter output from Compustar 87
For safety sake a diode (1N4004) across 85 and 86 with the band towards 86.
No constant supply to relay or you will be buying a new car battery!
Posted By: 12voltwiz
Date Posted: February 03, 2010 at 7:43 AM
the first time that relay goes out on you, you will wish you never did it anyway, if you insist on doing starter make sure you use a brand new bosch/tyco 30/40amp spdt relay.
Posted By: howie ll
Date Posted: February 03, 2010 at 8:37 AM
One assumes that, i.e. Bosch type 5 pin SPCO relay used, also the way I set it up, the relay will only activate if the alarm is ON and someone tries to hot wire it. It will FAILSAFE since starter in an outs are NC.
Posted By: ic3laxer
Date Posted: February 03, 2010 at 2:41 PM
howie ll wrote:
Forget all above the both of you are confusing me! This is how it should be wired. Ground when armed of Compustar 85
12V+ on ignition (BLACK / YELLOW) 86
Key side starter (BLACK/ white) 87a
Starter side of starter (BLACK/ white) 30
Starter output from Compustar 87
For safety sake a diode (1N4004) across 85 and 86 with the band towards 86.
No constant supply to relay or you will be buying a new car battery!
ok so if I change it to look like this what should I use for the ground when armed of compustar in 85? will any ground in my car work or is there a specific wire coming out of the compustar that I need to use? will i have to use the compustar wire labeled output to starter kill at all or is this relay going to mean I dont need that? and what about the wire coming from the compustar that is labeled output to ignition since i will be hooking up the cars ignition to the relay will i not have to connect this anywhere? just to clarify I will need to cut the starter wire while doing this right?
Posted By: t&t tech
Date Posted: February 03, 2010 at 3:56 PM
12voltwiz wrote:
the first time that relay goes out on you, you will wish you never did it anyway, if you insist on doing starter make sure you use a brand new bosch/tyco 30/40amp spdt relay.
The normally closed contact of the relay is in use here, so it's basically failsafe! Also relays tend to be very reliable regardless of the fact that they're not bosch or tyco! Been installing for years now and i've only seen a handfull of relays go bad, and in all instances it never caused a no start situation in a vehicle! ------------- COMMIT YOUR WAY TO JEHOVAH AND HE WILL ACT IN YOUR BEHALF.
PSALMS 37:5
Posted By: t&t tech
Date Posted: February 03, 2010 at 3:59 PM
To the OP, yes you need to cut the starter wire! The GWA (ground when armed wire, not a direct ground) also called output to starter kill, i think! ------------- COMMIT YOUR WAY TO JEHOVAH AND HE WILL ACT IN YOUR BEHALF.
PSALMS 37:5
Posted By: ic3laxer
Date Posted: February 03, 2010 at 4:11 PM
ok cool thanks and what about the output to ignition wire coming from the compustar brain will I need to connect this to anything?
Posted By: howie ll
Date Posted: February 03, 2010 at 5:33 PM
I think the GWR is blue, it's a wire that goes to ground when the alarm is armed, hence GWA. ONLY join that to 85 on the relay, also surely this ignition wire is a thick cable that powers the ignition. You know what with these questions, I'm really wondering if your knowledge level is up to this job, and frankly like t&t says in nearly 40 years in this business I've almost never seen failed relays except fuel pump primers on UK Fords and Porsches back in the early 90s. And yes they were made by Bosch or Hella. In fact many many years ago I was told that Lucas, Honeywell and Omron made just about all of them anyway!
Posted By: i am an idiot
Date Posted: February 03, 2010 at 6:43 PM
I have seen maybe 5 defective relays in my time. Only 2 that I would consider a failure. The other 3 had WAY too much current going through them. The only help I have is help that has already given, but not explained. Do not connect 86 to a constant voltage. If you do, the relay will be energized the entire time the alarm is armed. You will have a dead battery if you do not drive the car daily.
Posted By: ic3laxer
Date Posted: February 03, 2010 at 11:25 PM
howie ll wrote:
I think the GWR is blue, it's a wire that goes to ground when the alarm is armed, hence GWA. ONLY join that to 85 on the relay, also surely this ignition wire is a thick cable that powers the ignition. You know what with these questions, I'm really wondering if your knowledge level is up to this job, and frankly like t&t says in nearly 40 years in this business I've almost never seen failed relays except fuel pump primers on UK Fords and Porsches back in the early 90s. And yes they were made by Bosch or Hella. In fact many many years ago I was told that Lucas, Honeywell and Omron made just about all of them anyway!
yeah i admit my knowledge is def lacking but thats why i came here to learn. I have done quite a few full audio system installs and I figured with a little knowledge I could figure it out... but I have yet to find car security installs for dummies and I dont wanna screw up my car sooo idk kinda lost right now but I love to do things myself and learn so im not giving up yet.
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