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Diff between constant 12v and switched

Printed From: the12volt.com
Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=754
Printed Date: September 08, 2025 at 2:46 AM


Topic: Diff between constant 12v and switched

Posted By: Tuce_3000GT
Subject: Diff between constant 12v and switched
Date Posted: May 13, 2002 at 5:35 PM

I'm hooking up a system in my brothers 1994 corolla and the diagram shows 4 wires coming into the reciever besides speakers a constant 12v a switched 12v an illumination and a ground i have to match those w/ the factory 3 others battery, ignition, and ground. obviously i know what the ground is but how and which do i match up on the ohers. please help im extreamly frustrated.

                                                                                         Tuce



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1993 3000GT
Platinum Bosch 4
Custom Air filter
Snake Eyes



Replies:

Posted By: bberman1
Date Posted: May 13, 2002 at 6:59 PM

The Constant is a 12volt current that never shuts off. This allows the head unit to maintain its memory. A switched is connected to the ignition which turns the head unit on and off .  https://www.the12volt.com/installbay/detail.asp?info=alarm&year=1994&make=Toyota&model=Corolla&ID=18978&type=Stereo




Posted By: bberman1
Date Posted: May 13, 2002 at 7:03 PM
Forgot to mention on your new head unit it might not have an illumination wire. In this case you do not have to connect the illumination wire in your factory harness to anything


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