hi low/ fan relay

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jtm311

Member - Posts: 3

Joined: April 15, 2005

Location: United States

Posted: September 05, 2012 at 3:14 PM / IP Logged

Hello all,

I want to make a high/low relay setup for my car. does anyone see any problems with this design?

hi low/ fan relay -- posted image.

Thank you

John

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i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: September 05, 2012 at 3:42 PM / IP Logged

Are the 2 wires coming from the fan both positive wires? One low speed, and the other for high speed?

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jtm311

Member - Posts: 3

Joined: April 15, 2005

Location: United States

Posted: September 05, 2012 at 4:16 PM / IP Logged

yes one needs a 70 amp for high and one needs a 40 amp for low that is start up only of course.

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i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: September 05, 2012 at 8:11 PM / IP Logged

I see no problems with your diagram.

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oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: September 06, 2012 at 2:39 AM / IP Logged

I'd rather use 2 SPST relays, and hence also have redundancy.

If the top relay fails, you have no fan.

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jtm311

Member - Posts: 3

Joined: April 15, 2005

Location: United States

Posted: September 08, 2012 at 6:09 AM / IP Logged

Thank you I like the idea of added another realy.

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hi low/ fan relay

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