viper 5902 2nd accessory external relay

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=132615
Printed Date: July 05, 2025 at 5:44 AM

Topic: viper 5902 2nd accessory external relay

Posted By: mb07
Subject: viper 5902 2nd accessory external relay
Date Posted: November 08, 2012 at 2:09 AM

I'm putting in a Viper 5902 into a 2000 Chevrolet Silverado. I always prefer to hook up both ignitions and both accessories on GM's. I was going to use the PINK/BLACK to go straight to the 2nd ignition on the truck which leaves me with nothing for the 2nd accessory. How should I wire up an external relay and what from the brain will need to go to it. Thank you in advance!

Replies:

Posted By: chev104275
Date Posted: November 08, 2012 at 5:07 AM

https://www.the12volt.com/relays/relaydiagramm8.html#_index

Use the H2/12 orange wire from the viper

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If i Can't Install it I Don't need it Joe

Posted By: howie ll
Date Posted: November 08, 2012 at 5:15 AM

Look at these two diagrams.
A is the simplest, B is if you have "flex" or satellite relay outputs or NEG triggers. I believe you do.
Don't forget the MANDATORY diodes or say goodbye to the 5902.
Standard Bosch/Tycho "cube" relays if only 5 terminal types are available, you can still use, just don't use 87a.
:-acc_2.bmp

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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.

Posted By: howie ll
Date Posted: November 08, 2012 at 5:17 AM

And that should have been in diagram "B" but too lazy to look it up apologies and thanks to Chev!

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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.

Posted By: chev104275
Date Posted: November 08, 2012 at 5:35 AM

The only problem with the one I posted is there are no diodes so i would combine the 2 diagrams and add the diodes to the one I posted. Or just use howie's B diagram

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If i Can't Install it I Don't need it Joe

Posted By: mb07
Date Posted: November 08, 2012 at 8:53 AM

Thanks guys! Now is all this even really necessary on this truck? I'm reading in a lot of different topics that half the people are hooking up the 2 ignitions and the one accessory is apparently sufficient and the other half say its not.