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heated mirrors, what relay should i use?

Printed From: the12volt.com
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=129546
Printed Date: May 14, 2025 at 4:42 PM


Topic: heated mirrors, what relay should i use?

Posted By: dan 2002 f250
Subject: heated mirrors, what relay should i use?
Date Posted: December 05, 2011 at 4:32 PM

I have a 2002 f250. im putting in heated mirrors from a 2005, i have run all the wires and have the drivers side working, powered by a toggle switch in the dash. I need to hook up the pass side and I believe i need a relay? A SPDT will work, but im not sure why I will have 87a, an unused wire, hot when the mirrors are not turned on. Any advice would be appreciated. 



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Dan



Replies:

Posted By: howie ll
Date Posted: December 05, 2011 at 6:21 PM
If you run your power source to 87 rather than 30, then 87a won't be live and even if it was it won't draw any juice if not connected.
Or use a 4 pin relay.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.


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