Powering and grounding relays
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=34285
Printed Date: August 06, 2025 at 11:31 PM
Topic: Powering and grounding relays
Posted By: mears
Subject: Powering and grounding relays
Date Posted: June 21, 2004 at 8:23 AM
Also, how do you guys bring positive 12V to your relays and do you use 40A fuses to protect the wire going to #30? Do you run a wire all the way from the battery? Also, where do you ground? I don't want to just ground wherever I have the relays mounted because I don't want to introduce ground loops from having multiple ground points.
Replies:
Posted By: draasch
Date Posted: June 21, 2004 at 10:46 AM
what are you looking to do with the relays??????????????? ------------- Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt
Posted By: mears
Date Posted: June 21, 2004 at 11:17 AM
Door locks, powering fans, and switches.
Posted By: draasch
Date Posted: June 21, 2004 at 12:01 PM
you will need a 30 or 40 amp fuse....most items will work off 10 -20 amp fuse... ------------- Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt
Posted By: mears
Date Posted: June 21, 2004 at 12:09 PM
Ok, what about getting +12V to relay and ground points.
Posted By: draasch
Date Posted: June 21, 2004 at 4:29 PM
i need to correct my post.....i was typing toooooo fast...
that should read:
you will not need a 30 or 40 amp fuse....most items will work off 10 -20 amp fuse...
------------- Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt
Posted By: draasch
Date Posted: June 21, 2004 at 4:32 PM
you can ground to any part of metal under the dash.....depending on what kind of car, you may have some empty spots in the fuse box.....if not you can use the 12v wire on the ign. harness ------------- Good Luck
David
Ace Security
813-376-9778
Tampa
Donate to the 12volt
Posted By: mears
Date Posted: June 21, 2004 at 5:16 PM
bobk:
https://www.epanorama.net/documents/groundloop/basics.html
Posted By: mears
Date Posted: June 25, 2004 at 12:17 PM
They are all ground to the chasis, but different ground points can have varying resistances, which can cause a ground loop. Also, varying lengths of wire can cause loops.
Posted By: ka3vvv
Date Posted: June 26, 2004 at 2:02 AM
what are you trying to do
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