relays for electric fan in truck

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kaztheminotaur

Member - Posts: 48

Joined: September 29, 2009

Location: Pennsylvania, United States

Posted: March 31, 2010 at 7:34 AM / IP Logged

I don't think I can do this with a DPDT switch. I need (2) SPST switches.

relays for electric fan in truck - Page 6 -- posted image.

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oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: March 31, 2010 at 8:14 AM / IP Logged

What you were describing is a SP3T switch - ie, single pole, 3 position (normally with center off).

IE: auto - off - on

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kaztheminotaur

Member - Posts: 48

Joined: September 29, 2009

Location: Pennsylvania, United States

Posted: March 31, 2010 at 9:29 AM / IP Logged

Those seem kind of hard to find...one that meets my needs anyway. I checked mouser.com

I think it will be easier to use 2 SPST switches

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howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: March 31, 2010 at 9:34 AM / IP Logged

Surely a single SPDT centre off switch is all that's required?

Howard a sub-contractor and by the way Oldie you should see this post before the spell-check! Me fingers is too big for the bloody keyboard!

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kaztheminotaur

Member - Posts: 48

Joined: September 29, 2009

Location: Pennsylvania, United States

Posted: March 31, 2010 at 10:06 AM / IP Logged

I don't think that will work because the at rest position of the on switch needs to be open and the at rest position of the off switch needs to be closed.

Bah... I was thinking about this at work last night. I'm sure there is a simple solution to this that I'm not getting...

relays for electric fan in truck - Page 6 -- posted image.

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kaztheminotaur

Member - Posts: 48

Joined: September 29, 2009

Location: Pennsylvania, United States

Posted: March 31, 2010 at 10:11 AM / IP Logged

Both switches will have to be able to be closed at the same time for the maual on to work, However the manual off will work regardless of the position of the on switch.

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kaztheminotaur

Member - Posts: 48

Joined: September 29, 2009

Location: Pennsylvania, United States

Posted: April 10, 2010 at 5:43 AM / IP Logged

Today is the big day for the electric fan install. This past week I have been running all the wiring for the fan. I have the relays all wired up and ready to put in. Last night I took out the belt driven fan.

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kaztheminotaur

Member - Posts: 48

Joined: September 29, 2009

Location: Pennsylvania, United States

Posted: April 10, 2010 at 8:14 PM / IP Logged

Well I got everything installed.

I need a diode on the fan because, at 30 mph., the fan makes enough current to make the LED light dimly.

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relays for electric fan in truck

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