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gauges with switch and relay

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=117650
Printed Date: May 16, 2025 at 6:47 PM


Topic: gauges with switch and relay

Posted By: robertas123
Subject: gauges with switch and relay
Date Posted: November 11, 2009 at 11:53 AM

Hi, i am trying to install gauges whitch i could turn on and turn off with a switch. For this i will be using relay. It's a first time when i am making something wiht relays. I what to use it because one gauge needs 10A fuse so 3 gauges 30A fuse and it goes for 30A shwitch. So i decided to use arely that i could use less amperage switch. Here are some schemes of my wiring, could anyone tell me where is correct position of fuses? To use it before switch or before gauge? Any other suggestions, my made mistakes?
https://www.freewebs.com/skerdienah/gauges.jpg
https://www.freewebs.com/skerdienah/gauges2.jpg
Constant 12V is used to save gauges memory.
For gauges turn on/off i use switched 12V wire.
I made my schemes using this one: https://dsl.torque.net/images/relaycircuit.gif
Thanks folks for any help.



Replies:

Posted By: howie ll
Date Posted: November 11, 2009 at 12:55 PM
Main fuse at the battery (your source) please.



Posted By: oldspark
Date Posted: November 11, 2009 at 10:15 PM
Just common their power & connect to your meter fuse.
Don't confuse their connection to a 10A fuse with their consumption - they probably take under 1A combined.

It won't matter if you meter fuse isn't 10A - some may be 15A etc.
Otherwise to any fuse that is only powered when the ignition is powered.


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