odd head unit wiring
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=93651
Printed Date: July 05, 2025 at 5:37 AM
Topic: odd head unit wiring
Posted By: pidgion
Subject: odd head unit wiring
Date Posted: May 05, 2007 at 10:20 PM
hi im installing a new head deck for the first time but im stuck, ive determined which cables are for speakers which leaves 4 1 is deffinatly ground and one is the ignition 12v which leaves two one is either illumination or dimmer, with park lights on 11.54V and dimmed beam 11.18, what exactly is illumination the finnal cable by my logic should be constant 12V but it shows 0V-0.2V so im a bit stumped
Replies:
Posted By: trenchwarrior
Date Posted: May 06, 2007 at 12:16 AM
When you checked the last wire did you do two seperate tests, one with the car off and another with the car turned to accesory? If it's reading 0V with the car off and between 11-13 roughly with the car on accessory then that's your switched 12V wire. Usually goes to the red on aftermarket head units.
Posted By: DYohn
Date Posted: May 06, 2007 at 8:50 AM
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