How to wire two relays

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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=28702
Printed Date: July 18, 2025 at 1:39 AM

Topic: How to wire two relays

Posted By: edawg134
Subject: How to wire two relays
Date Posted: March 19, 2004 at 10:35 PM

This is my first post, but I've been reading a lot and have learned quite a bit.

I want to install a roof monitor, dvd player, fm modulater, 400W inverter and wireless headphones.

I want to wire direct from the battery and use two relays, one for the video system, the other for the inverter.

Now , my question is how do I wire the two relays? :errr:Do I have to wire them together off of the power wire and if so how or do I connect them separately?

Thanks in advance 8D

Replies:

Posted By: Cozz
Date Posted: March 20, 2004 at 8:38 PM

Sure, you can use a single switch to turn on 2 relays for seperate sources.

PIN 87- Fused constant source 12 volts
Pin 30- Switched output power to multimedia
Pin 86- Constant 12 volts (looped from pin 87)
Pin 85- Switched input, use a ground input to turn on the relay.

Make 2 relays like above with 2 seperate fuses and merge the 85's to a single switch

Posted By: edawg134
Date Posted: March 21, 2004 at 10:13 PM

Thanks for the reply posted_image

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