Switched Source

Old 07-12-2011, 07:53 PM
  #1  
Party Rock Crew
Thread Starter
 
starrman's Avatar
 
Join Date: Feb 2011
Location: East Freakin NC baby, yeeyauh
Posts: 1,805
Switched Source

I am installing 2 gauges and a pump for my FMIC, I found one switched source in the under-dash fuse box, the two identical terminals above I thought were switched sources, but apparently not. One was constant power and the other did not give me anything? I am an electrical idiot and probably should not be attempting this, but hey what better way to learn. Can anyone give me some direction on where to hook up the other two leads? Thanks!
starrman is offline  
Old 07-12-2011, 09:24 PM
  #2  
Senior Member, Literally
 
philiam's Avatar
 
Join Date: Sep 2007
Location: woodland hills, CA
Posts: 4,442
Get a continuity tester for a couple of bucks. Clip one end to the wire in question and touch the other to ground. If it lights up the wire is hot. Touch the other end to the dead wire to see if it is a ground.
philiam is offline  
Old 07-13-2011, 06:51 AM
  #3  
Party Rock Crew
Thread Starter
 
starrman's Avatar
 
Join Date: Feb 2011
Location: East Freakin NC baby, yeeyauh
Posts: 1,805
I found one switched source, but not sure how to hook 3 things to the one terminal? I was also told I would need to fuse all 3 devices...pump and 2 gauges.
starrman is offline  
Old 07-13-2011, 02:09 PM
  #4  
Senior Member, Literally
 
philiam's Avatar
 
Join Date: Sep 2007
Location: woodland hills, CA
Posts: 4,442
Originally Posted by starrman View Post
I found one switched source, but not sure how to hook 3 things to the one terminal? I was also told I would need to fuse all 3 devices...pump and 2 gauges.
Did any kind of schematic come with the device? I'm not familiar with it but it should be simple. Maybe someone else can chime in here.
philiam is offline  
Old 07-13-2011, 02:49 PM
  #5  
Party Rock Crew
Thread Starter
 
starrman's Avatar
 
Join Date: Feb 2011
Location: East Freakin NC baby, yeeyauh
Posts: 1,805
They just tell you to hook the red wire to a switched source. Since I know for sure that one of the terminals is a switched source, I am going to hook a relay into that and then hook all 3 into the relay.
starrman is offline  
Old 07-13-2011, 03:04 PM
  #6  
Senior Member, Literally
 
philiam's Avatar
 
Join Date: Sep 2007
Location: woodland hills, CA
Posts: 4,442
I'm shooting in the dark here but...

If there is only one red wire, that would connect to the hot source. Black or white would usually be ground wires. Unless it calls for a relay I don't see the purpose of installing one.
philiam is offline  
Old 07-13-2011, 03:07 PM
  #7  
Party Rock Crew
Thread Starter
 
starrman's Avatar
 
Join Date: Feb 2011
Location: East Freakin NC baby, yeeyauh
Posts: 1,805
Since there is only one switched source in the underdash fuse block, I was going to hook all 3 devices into that one source via a relay????
starrman is offline  
Old 07-13-2011, 03:22 PM
  #8  
Senior Member, Literally
 
philiam's Avatar
 
Join Date: Sep 2007
Location: woodland hills, CA
Posts: 4,442
By "switched source" I assume they mean, connected to the ignition switch. A relay would seem to be redundant. Relays are usually used when you need to draw more power than the switch can provide, with the secondary circuit hooked to the battery using larger gauge(smaller number) wires.

Try hooking up the red wire, turn on the ignition and then checking to see if the other wires become hot.
You might also try Googling the maker and look for an on line manual or instructions. They may have a customer help desk.

Last edited by philiam; 07-13-2011 at 03:27 PM.
philiam is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
philiam
Exterior / Detailing / Body Work
10
02-11-2010 02:21 PM


Thread Tools
Search this Thread
Quick Reply: Switched Source


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.