12V Relay Back Feed
Printed From: the12volt.comForum 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=147261
Printed Date: May 02, 2025 at 9:50 AM
Topic: 12V Relay Back Feed
Posted By: millsner
Subject: 12V Relay Back Feed
Date Posted: February 14, 2022 at 11:13 AM
Hello, new to forum. Trying to wire up an override switch for my electric fans on my hot rod but for some reason I keep getting back feed from the battery circuit to the ignition circuit on my override relay. I can tell the back feed is coming from the 85/86 side of the override relay as when either side of this is unplugged, the back feed stops. Also if I unplug the 30 on the override relay this will also stop the back feed. Looking for some help on how to properly wire this up. I want the fans to work on ignition normally but when i push the fan override switch, I would like that fan relay to then be powered off of battery power. I have attached a quick schematic.
-------------
Millsner
-------------
Millsner
Replies:
Posted By: catback
Date Posted: February 14, 2022 at 4:25 PM
This your backfeed path. I suggest you try a different circuit design.
