30a switch, relay needed?

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jettagli03

Copper - Posts: 311

Joined: January 16, 2005

Location: United States

Posted: May 03, 2010 at 2:58 PM / IP Logged

I am putting my two gauges in my car on a switch. If they both combined use less than 30A, which I'm sure they do, do I need to use a relay if the switch I have is rated at 30A?

Thanks!

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KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: May 03, 2010 at 3:58 PM / IP Logged

No, you wouldn't. Just make sure your wire is large enough and is fused properly.

Kevin Pierson

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i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: May 03, 2010 at 5:58 PM / IP Logged

What kind of gauges do you have that the 2 may pull 30 amps of current to operate?

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oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: May 03, 2010 at 9:29 PM / IP Logged

Ditto! (Not an ammeter surely!!!)

And why use a relay of the switch is rated for 30A??!!

Gauges are unlikely to draw more than 1 Amp if that.

And hence there is no need for a relay - the normal "metering" circuit is usually fine. (One exception - voltmeters - they should be measuring battery voltage - ie, direct from battery + & - terminals.)

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jettagli03

Copper - Posts: 311

Joined: January 16, 2005

Location: United States

Posted: May 04, 2010 at 12:22 AM / IP Logged

I was not home to see what they pull for amperage (1.3A per and the are AEM digitals - wideband o2 and boost) I just wanted to make sure I didn't need a relay as I'm new to using relays and switches.

Thanks for your help!

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howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: May 04, 2010 at 4:51 PM / IP Logged

Doubt if they pull more than 500milliamps combined + illumination on a separate circuit. I can't for the life of me see why you need to switch gauges.

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30a switch, relay needed?

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