alarm out to stereo on, open gas door
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=102104
Printed Date: April 27, 2024 at 4:03 AM
Topic: alarm out to stereo on, open gas door
Posted By: dj_lawz
Subject: alarm out to stereo on, open gas door
Date Posted: February 11, 2008 at 9:06 PM
how can i wire a relay from one of the alarm's aux channel (-) to the stereo accesory wire??? and i also would like the gas door to be opened with one of the alarm's aux channel (-)... how can i do this?
Replies:
Posted By: KPierson
Date Posted: February 11, 2008 at 9:37 PM
For the radio you'll need a relay triggered off the AUX channel. The NO contacts of the relay will be used to provide 12vdc constant power on the switched power line of the radio. For a gas door you would do something very similar, but the actual hookup would depend on the gas door interface. ------------- Kevin Pierson
Posted By: chadwa2003
Date Posted: February 11, 2008 at 9:39 PM
What kind of car and what kind of alarm?
You will need one relay for sure for the radio, 85 to -aux of alarm, 86 & 87 to 12 fused 12 volt constant and 30 to accessory lead of your radio.
For the gas door you may need a relay and you may not the neg output on the aux channel may be enough even though it is a very low current output it could still pop the gas door. If not you would wire it like so if it was a negative trigger 85 to aux, 86 to a fused 12 volt 87 to chassis ground and 30 to the gas door. If it a positive trigger 85 to aux, 86 & 87 to fused 12 volt and 30 to the gas door.
Posted By: dj_lawz
Date Posted: February 11, 2008 at 9:59 PM
ok that seems pretty simple, and if i don't need a relay for the gas door that's even better  but in case i do it still is a pretty easy hookup thanks for the help.......
Posted By: tedmond
Date Posted: February 12, 2008 at 2:50 PM
what car do you own? running a system when the car is off strains the battery alot. well heres how to wire it up, also what is the alarm you have? before you do anything, purchase a Relay, relay harness and 15 amp fuse !! 1) set your alarm to do a latched output on the aux channel wiring relay. 85 - aux from alarm (latched)
86 - constant 12v
87 - high current 12v fused at 15 amps
30 - to Acc wire @ radio OR at ignition harness.
Posted By: dj_lawz
Date Posted: February 12, 2008 at 6:46 PM
ok i got the gas door working, but the stereo not so much, it turns on but only if i keep the buttons on the remote pressed as soon as i let go the stereo turns off.. how do i set my alarm so i don't have to keep holding the buttons
Posted By: dj_lawz
Date Posted: February 12, 2008 at 6:49 PM
oh by the way, its a viper5 5900 alarm and my car is a 2000 lincoln town car.
Posted By: ibasspro
Date Posted: February 12, 2008 at 7:59 PM
good info every1, but he will have a problem only using a relay, he needs a relay & a diode, otherwise he will be powering the acc. system in the car. hook up the relay as stated, between were you tapped the swithced wire for the deck & the vehicle, put in a 3 amp diode, with the cathode (side with the little line on it) facing the deck. this way you will power the deck & nothing else. YAY! ------------- used to be loud, used to be fast...now I am married LOL
Posted By: dj_lawz
Date Posted: February 12, 2008 at 10:23 PM
ibasspro wrote:
good info every1, but he will have a problem only using a relay, he needs a relay & a diode, otherwise he will be powering the acc. system in the car. hook up the relay as stated, between were you tapped the swithced wire for the deck & the vehicle, put in a 3 amp diode, with the cathode (side with the little line on it) facing the deck. this way you will power the deck & nothing else. YAY!
HEY THANKS FOR THE INFO, BUT HOW CAN I PROGRAM MY ALARM TO BE LATCHED INSTEAD OF PULSE?
Posted By: flobee4
Date Posted: February 13, 2008 at 12:56 AM
ibasspro thats a good point about him powering the accessories if he doesn't isolate the accessory wire. I would probably just "Five-wire" the relay. Its easy to do and you don't need anything extra, just the relay. wire like this: First off cut the accessory wire yo the radio in half. You'll be left with 2 sides - the car side and the radio side. 86 - Constant +12V Fused 85 - (-) Aux.Channel - set to latched 87 - Accessory wire - car side 87a - Constant +12v Fused 30 - Accessory wire - Radio Side As for setting your 5900 to a latched output, I'm sorry but I've only installed a few of them. I do Know that is in the installation manual, because I've changed that myself on a few installs. Just take a look :o) Frank
Posted By: flobee4
Date Posted: February 13, 2008 at 1:01 AM
wow, lookie here. I found the installation manual right on this site. How's that for convenience! Gotta love the12volt.com!! https://www.the12volt.com/installbay/file.asp?ID=618 Page 43, You want to change the validity option Good Luck, Frank
Posted By: KPierson
Date Posted: February 13, 2008 at 5:45 AM
ibasspro wrote:
good info every1, but he will have a problem only using a relay, he needs a relay & a diode, otherwise he will be powering the acc. system in the car. hook up the relay as stated, between were you tapped the swithced wire for the deck & the vehicle, put in a 3 amp diode, with the cathode (side with the little line on it) facing the deck. this way you will power the deck & nothing else. YAY!
You got to be careful doing this, as you need to make sure your diode can carry enough current to power the deck and its internal amp. Depending on the radio, this could be >10A. By undersizing your diode you can create a fire hazard that won't be protected by fuses. This is one of these 'installer discretion' areas. Depending on the car the accessory circuit may or may not have a bunch of other stuff on it. If in doubt a relay, not a diode, should be used to achieve the isolation, either in a 5 wire mode or by controlling the deck directly. If you control the deck directly you can then safely diode isolate the (+) side of the coil and know your load will be less then 500mA. ------------- Kevin Pierson
Posted By: chadwa2003
Date Posted: February 13, 2008 at 1:34 PM
You could just use a relay to trigger the radio
85 to -aux
86 and 87 to fused 12 volt
87a to car side of radio acc
30 to radio side of acc
You should have no problems by doing this and no chance of feedback
Posted By: tedmond
Date Posted: February 13, 2008 at 2:39 PM
that is true, just prevent backfeed on the relay, place a diode across relay coils 85 and 86, the cathode band on diode (white stripe) alwas goes tot he postive side.
Posted By: KPierson
Date Posted: February 13, 2008 at 2:51 PM
The alarm should have a supression diode on the output of the AUX channel, so the diode here should't be needed. It won't hurt, but isn't needed. ------------- Kevin Pierson
Posted By: dj_lawz
Date Posted: February 13, 2008 at 7:09 PM
flobee4 wrote:
wow, lookie here. I found the installation manual right on this site. How's that for convenience! Gotta love the12volt.com!! https://www.the12volt.com/installbay/file.asp?ID=618 Page 43, You want to change the validity option Good Luck, Frank
thanks bro! i finally figure it out
Posted By: dj_lawz
Date Posted: February 14, 2008 at 7:48 PM
flobee4 wrote:
ibasspro thats a good point about him powering the accessories if he doesn't isolate the accessory wire. I would probably just "Five-wire" the relay. Its easy to do and you don't need anything extra, just the relay. wire like this: First off cut the accessory wire yo the radio in half. You'll be left with 2 sides - the car side and the radio side. 86 - Constant +12V Fused 85 - (-) Aux.Channel - set to latched 87 - Accessory wire - car side 87a - Constant +12v Fused 30 - Accessory wire - Radio Side As for setting your 5900 to a latched output, I'm sorry but I've only installed a few of them. I do Know that is in the installation manual, because I've changed that myself on a few installs. Just take a look :o) Frank
hey do i reall have to wire it this way? the way i have it is like this 86 n 87 12v 30 accesory wire 85 output from alarm and this works great... or do i have to rewire it like you are showing me there?
Posted By: KPierson
Date Posted: February 14, 2008 at 8:11 PM
You don't have to wire it that way. The advantage to wiring it the way that was posted above is that you will only be powering the radio. If you try to power the entire accessory circuit it is possible you could be powering heater blowers or other large loads that could drain the battery faster. It all depends on the vehicle you have and how you plan on using this.
-------------
Kevin Pierson
Posted By: dj_lawz
Date Posted: February 14, 2008 at 10:11 PM
KPierson wrote:
You don't have to wire it that way. The advantage to wiring it the way that was posted above is that you will only be powering the radio. If you try to power the entire accessory circuit it is possible you could be powering heater blowers or other large loads that could drain the battery faster. It all depends on the vehicle you have and how you plan on using this.
oh, ok i got you, well i think the accesoy its only for the stereo and power windows and that's about it..... but i will rewire it so i only power the stereo thanks for the help bro!!
Posted By: dj_lawz
Date Posted: February 14, 2008 at 10:21 PM
oh one last question can you tell me how to wire the horn(-) output from alarm to the horn wire(-) using a relay someone on here told me before but it didn't work.... thanks in advance.
Posted By: tedmond
Date Posted: February 15, 2008 at 8:03 PM
85 - constant 12v
86 - horn output from main unit
87 - ground (high current)
30 - to horn wire on car.
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