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rear defogger 5 wire

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=139387
Printed Date: May 13, 2025 at 4:58 AM


Topic: rear defogger 5 wire

Posted By: mleaser
Subject: rear defogger 5 wire
Date Posted: September 03, 2015 at 8:13 PM

Would this consist of cutting the wire in half, wiring it to a latching relay (30 & 87a) and sending 12v towards the defogger?



Replies:

Posted By: howie ll
Date Posted: September 04, 2015 at 5:49 PM
Trigger to 85.
Constant live, 15 amp fused to 86 and 87.
Cut existing wire.
Switch side to 87a.
Defogger side to 30.
You'll need to place a 1 amp diode 1N4004 across 85 and 86, band to 86 to protect your alarm or remote start.

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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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