Do i need a relay?

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=6088
Printed Date: August 16, 2025 at 2:03 PM

Topic: Do i need a relay?

Posted By: pain_is_lov3
Subject: Do i need a relay?
Date Posted: November 30, 2002 at 11:29 PM

I have an EQ and 2 amps to hook up. So can i just use the remote turn on from the head unit or do i need a relay? If i dont need a relay then how would i wire the amps and the EQ up to the remote turn on wire?

Replies:

Posted By: djfearny2
Date Posted: November 30, 2002 at 11:47 PM

well a relay will protect your remote turn on but it should not be neccesary . but if you want here is how to do it.

pin 85 positive input from radios remote turn on

pin 86 ground

pin 87 constant 12 volts fused at ten amps or five

pin 30 output to all the components amps eq etc. pin 87a not used

now if somethign happens you will not damage the radio you will just blow the fuse you add on to pin 87

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Jon
Installer/Help Technician
---coral springs florida---
mecp certification is not always needed. I have it and it has not helped me out at all. my experience out shines it.

Posted By: bberman1
Date Posted: December 01, 2002 at 11:30 AM

Like djfearny2 said for that setup you don’t need to install a relay.

Posted By: OmarZ
Date Posted: December 01, 2002 at 1:41 PM

When would you need a relay there and how do you know? The same setup with a power antenna? (and no antenna output on the deck) What about number of amplifiers to be turned on?

Posted By: pain_is_lov3
Date Posted: December 01, 2002 at 8:42 PM

Ok i dont need a relay so how would i wire all those up to the remote turn on?

Posted By: bberman1
Date Posted: December 02, 2002 at 1:56 PM

Just take the remote turn on and solder or crimp all of your connections together. As far as a relay goes I like to use on when ever I have more than 4 connections to my remote turn on. But if you have a power antenna and no antenna turn on then defiantly use a relay.