Fan start when stereo turned on

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agne

Member - Posts: 9

Joined: February 03, 2005

Location: Sweden

Posted: November 30, 2006 at 2:47 PM / IP Logged

Hi everyone, I'm trying to build a fansystem thats starts when I start my stereo. I have my amp built in a box and have fans that I want to start with the remote signal from the stereo. And if the fans for some reason doesnt starta I want a light to show that on my dashboard. I have bought a closed and a switched relay but dosent really know how to connect it all. Thanks in advance.

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: November 30, 2006 at 8:53 PM / IP Logged

Fan start when stereo turned on -- posted image.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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agne

Member - Posts: 9

Joined: February 03, 2005

Location: Sweden

Posted: November 30, 2006 at 11:06 PM / IP Logged

Thanks now half of the idea I had works, fans etc starts when it gets signal on remote. Now to the other part of my problem. Im trying to get a light to show if the fans didn't start. I have tried to connect the diffret relays on various ways but can't seem to find the right way to do it. :S

master5

Silver - Posts: 1,123

Joined: October 10, 2006

Location: United States

Posted: December 01, 2006 at 1:56 AM / IP Logged

The indicator light is simple. connect one wire of a 12v light bulb to 30..the other to ground..if using an led make sure the anode (the longer leg on a raw LED or red on a wired led) is connected to +, which is again 30..and the other to ground. Make sure it is a 12v led (it will have a resistor) or you will need to add one. I would need the voltage/current spec of the led to recommend a value.

However bear in mind the LED can only tell you if 12v is coming out of the relay..it will not let you know if the fan or its wiring connections develop a problem and is not operating.

agne

Member - Posts: 9

Joined: February 03, 2005

Location: Sweden

Posted: December 01, 2006 at 3:45 AM / IP Logged

I have a red lamp that is made for 12v however I'm kinda newbie at this and maybe I should just drop it. When I do as u posted above the light is on when the fans are I want it to be the other way around when the fans is off I want the light to be on and when the fans are on the light to be off. I'm trying to do this with to relays but cant get it to work.

master5

Silver - Posts: 1,123

Joined: October 10, 2006

Location: United States

Posted: December 01, 2006 at 7:09 AM / IP Logged

This circuit will do what you want..the reason 30 of the second relay will go to accessory (not ignition) is so the light will turn off when the key is off to save the battery. But when the system is on..the light will be off and when off light will be on

master5

Silver - Posts: 1,123

Joined: October 10, 2006

Location: United States

Posted: December 01, 2006 at 7:16 AM / IP Logged

Actually...do it this way and you won't even need the 2nd relay...

Fan start when stereo turned on -- posted image.

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: December 01, 2006 at 11:11 AM / IP Logged

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: December 01, 2006 at 11:20 AM / IP Logged

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

master5

Silver - Posts: 1,123

Joined: October 10, 2006

Location: United States

Posted: December 01, 2006 at 2:01 PM / IP Logged

ah pretty slick there john..use the ground through the motor windings when off to turn the bulb on..impressive. Good Job !

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