’99 Toyota Avalon Common Negative

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=82369
Printed Date: May 14, 2025 at 2:39 PM

Topic: ’99 Toyota Avalon Common Negative

Posted By: georgiacanon
Subject: ’99 Toyota Avalon Common Negative
Date Posted: September 01, 2006 at 9:07 PM

I am trying to install a Alpine head unit into a '99 Toyota Avalon with a Factory Amplied Premium Stereo. I am using a Best wiring harness. Model# BHA8110. The problem is I can not find the common negative wire for the front and rear speakers. Also the instructions that came with the harness recommends I use a Periperal SVEN4 to interface the factory amplified system. I have installed alot of head units this is the first one that does not seem to be pretty staight forward. I would appreciate any help or ideas.

Thanks,

Robbie

Replies:

Posted By: georgiacanon
Date Posted: September 01, 2006 at 9:14 PM

This system has 4 separate positve inputs and one common negative. I cannot figure out where to hook the 4 negative output wires from the head unit to.

Posted By: KarTuneMan
Date Posted: September 02, 2006 at 11:04 AM

https://www.the12volt.com/installbay/detail.asp?info=alarm&year=1999&make=Toyota&model=Avalon&ID=18947&type=Stereo

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Posted By: tcss
Date Posted: September 02, 2006 at 3:32 PM

Those are the wire colors AFTER the factory amp. Could it be that he is using a preamp input harness and the common ground is for the grounds on the decks RCAs which are hooked together? I'm not familiar with the Best harnesses.

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