Turn on lead advice for 3 devices

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=16936
Printed Date: July 27, 2025 at 4:42 AM

Topic: Turn on lead advice for 3 devices

Posted By: eurosam
Subject: Turn on lead advice for 3 devices
Date Posted: July 31, 2003 at 1:52 PM

I have some turn on lead noise coming through my speakers. I have 3 pieces of equipment to turn on and the stereo can not supply enough current. Is the best fix a relay to turn on the equipment safely? I have 2 amplifiers and a digital processor. Any help would be appreciated. Thanks

Replies:

Posted By: bberman1
Date Posted: July 31, 2003 at 1:59 PM

With 3 devices you should not need a relay. What do you mean by turn on lead noise? Dose it pop when you turn on the head unit? But if you want to hook up a relay you will need a SPDT below is a diagram of how to wire it

Positive Input-----> Positive Output Relay Diagram:
• 87 - Constant
• 86 : GROUND
• 30 - Remote Wire Accessories ( amps, EQ's, processors )
• 85 : Remote Input from HU
87a: NOT USED

Posted By: esmith69
Date Posted: July 31, 2003 at 2:35 PM

also I usually add an inline fuse (3A) for the constant power connection

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Ethan
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"Patience, persistence, and perspiration make an unbeatable combination for success"
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