multi acc turn on w/ diode

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=96779
Printed Date: November 04, 2025 at 12:20 AM

Topic: multi acc turn on w/ diode

Posted By: carstereoman
Subject: multi acc turn on w/ diode
Date Posted: August 30, 2007 at 7:19 PM

I know how to wire up this relay but I took a class at MERA and the rockford guys said they always use a diode so that it doesn't backfeed. Anyone know where to put it and which way it goes?

30 - remote to amps or accessories
85 - ground
86 - turn on lead from head unit
87 - 12 v +
87a- N/A

Thanks!!!

Replies:

Posted By: i am an idiot
Date Posted: August 31, 2007 at 2:23 PM

Across 85 and 86 The band of the diode on power.

Posted By: carstereoman
Date Posted: September 04, 2007 at 6:20 PM

How does this work? I called RF (Know a guy that works there) and he says Put the diode on the output (30 pin on relay) w/ the black portion facing the input and the white line facing the output.

Posted By: i am an idiot
Date Posted: September 09, 2007 at 3:46 PM

I have no idea what they are trying to achieve by putting it there. The purpose of across 85 and 86 is to eliminate the pop in the audio system everytime the relay is turned off. A diode has a current rating, you need to make sure it will handle the current of your devices if you put it where the Rockford guy tells you.

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