max number of relays on one aux output?
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=132851
Printed Date: May 17, 2024 at 4:21 PM
Topic: max number of relays on one aux output?
Posted By: eddiebx
Subject: max number of relays on one aux output?
Date Posted: December 01, 2012 at 8:19 PM
Hey guys, out of curiosity would anyone know roughly how many relays I can hook up to the AUX outputs on my Viper alarm?
According to the manual the defroster output is rated at 200ma ground, and I have 3 separate factory relays that I would like to trigger if it's possible. These relays are factory Toyota relays which appear to be made by Denso (light blue in color and about half the width of a typical automotive relay).
They are for the rear defroster, heater mirrors and front wiper de-icer, and I was hoping to trigger all 3 simultaneously.
I searched a bit and could not find any spec sheets on this type of relay so I have no clue how much the coil current is....
Would it hurt the alarm to just hook up all three and see if it's enough to drive them? I'm leaning towards maybe a bad idea?
I guess I could just use the defroster output to trigger a relay which then can trigger the three factory ones?
Just brain storming out loud, I'd appreciate any suggestions, thanks!
Replies:
Posted By: Ween
Date Posted: December 01, 2012 at 8:58 PM
it would be best to trigger one relay, then use diodes on the output of that relay to isolate each of the devices needed to be activated.
Posted By: KPierson
Date Posted: December 01, 2012 at 9:22 PM
If you can pull a relay out and measure the resistance of the coil you can calculate the current required to energize it (voltage = current x resistance)
A 200mA output is pretty low. I would follow Ween's advice and only power one relay off of the output. You can either diode isolate like Ween suggested or run virtually as many relays by powering their coils through the contacts of the first relay.
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Kevin Pierson
Posted By: eddiebx
Date Posted: December 01, 2012 at 9:37 PM
Thanks for all the suggestions, I don't even know why I didn't think to just measure the resistance of the relay coil!
I think am just going to go with your suggestions and first drive a relay and then isolate with diodes.
Posted By: howie ll
Date Posted: December 02, 2012 at 1:36 AM
I think they are Omron "half" cube relays, Mitsubishi use the same but black.
They have identical properties as the "normal" Bosch/Tycho type.
Go with Kevin's post, one relay to trigger the others.
Diodes mandatory or say goodbye to the Viper output and lock board.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
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