trigger relay from two different sources

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hudd4473

Member - Posts: 31

Joined: December 31, 2002

Location: United States

Posted: April 29, 2012 at 10:22 AM / IP Logged

I currently have a relay for an aux fuse block triggered by the ign(+)...I want to be able to hook a rocker switch so i can trigger the relay w/ the ign off but i dont want it to backfeed and power everything on that side of the ign switch...what diode would i use? or is there some other way to do this?

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howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: April 29, 2012 at 10:52 AM / IP Logged

Wire each wire to 86 on the relay with inline diodes, see diagram:-

2_source_relay.bmp

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hudd4473

Member - Posts: 31

Joined: December 31, 2002

Location: United States

Posted: April 29, 2012 at 12:41 PM / IP Logged

thats exactly how i want to do it but what diodes should i use....do you know a part or model number seems like a bunch of different ones out there...thanks for the help

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kreg357

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Joined: January 30, 2009

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Posted: April 29, 2012 at 1:10 PM / IP Logged

Use 1N4004 diodes as long as the relay coil is the only current draw ( as per Howards diagram ). Available at RadioShack, etc.

Soldering is fun!

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i am an idiot

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Posted: April 29, 2012 at 5:57 PM / IP Logged

1N4001 thru 1N4007

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trigger relay from two different sources

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