relay to turn off power

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i am an idiot

Platinum - Posts: 13,672

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 26, 2008 at 10:33 PM / IP Logged

I edited it after you read it I happened to read it again and caught the error. I am sure that the lack of the diode Did not take it out.

kaptan

Member - Posts: 19

Joined: July 22, 2005

Location: United States

Posted: April 27, 2008 at 9:10 AM / IP Logged

Ok, thats kinda what I thought you meant, but you know on the internet, you can't read facial expressions or hear the tone of voice... Anyway, I can't see where I have something hooked up wrong.. I started to think something was wrong with that part of the controller.. It works fine "thermostatically".... just the stupid manual by-pass thats built in.. So really what I'm doing is trying to make my own manual by-pass.

Thanks again.

Sony Mp3 HU, Dig/Aud 300Wts

(1) 12"sony sub.. Aint much, but it looks good, and thumps like a rabbit on Viagra!

i am an idiot

Platinum - Posts: 13,672

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 27, 2008 at 4:30 PM / IP Logged

You need to cut the wire between the controller and the fan. I still do not know what wire it is, ground or power. Cut the wire and connect the fan wire to terminal 30 of the new relay. connect 87A to the wire that comes from the controller. Terminal 87 needs to be provided with a high current capable connection to either power or ground. Whichever the controller supplies to the fan is what you need to connect to 87. 85 and 86 are the coil of the relay, power to one and ground to the other will energize the relay and turn the fan on. with no power on the coil the controller is connected to the fan.

kaptan

Member - Posts: 19

Joined: July 22, 2005

Location: United States

Posted: April 27, 2008 at 6:03 PM / IP Logged

relay to turn off power - Page 2 -- posted image.

Sony Mp3 HU, Dig/Aud 300Wts

(1) 12"sony sub.. Aint much, but it looks good, and thumps like a rabbit on Viagra!

kaptan

Member - Posts: 19

Joined: July 22, 2005

Location: United States

Posted: April 27, 2008 at 6:06 PM / IP Logged

So this is what I drew from your discription.. What do you think?.. I left the fuses out, but I thought I'd put one in the (+) to the 87 terminal...a 40 amp, because thats what it has before the controller.. Is this good to go?.. THANKS AGAIN!!

Sony Mp3 HU, Dig/Aud 300Wts

(1) 12"sony sub.. Aint much, but it looks good, and thumps like a rabbit on Viagra!

i am an idiot

Platinum - Posts: 13,672

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 27, 2008 at 6:33 PM / IP Logged

All looks good. You just need to put a 3 amp fuse feeding the switch.

dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: April 27, 2008 at 8:47 PM / IP Logged

Are you sure that diagram is right? How does your thermostatic controller switch the relay without a connection to the coil? It's just going to the normally closed connection to the fan power?

i am an idiot

Platinum - Posts: 13,672

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 27, 2008 at 8:55 PM / IP Logged

kaptan wrote:

FIRST THE STORY: I've got a relay that turns on an electric fan, it has a thermostatic controler that activates the relay and of coarse then the fan runs from direct power from the battery. Now, the controller has another wire that allows you to "bypass" the thermostat, and turn on the fan manually..BUT, when I wired this up using a simple on/off switch, it blew fuse after fuse, and now it has burned up the switch. I cannot find a short, It would work for a day or two, then the fuse would blow. Now the switch no longer works, but the thermostatic control does still work...

SO here's the solution I need help with.. I want to wire a relay to turn off the thermostatic controller, and run the fan, from a switch on the dash.. This is so I can run the fan manually to cool the A/C, when the radiator is not hot enough to turn on the fan. I've already been asked, why don't I just wire the fan to the A/C so that it runs when the A/C is on?... Answer: I take long trips and don't want the fan running as I'm traveling down the highway at 70 mph, with the A/C on for 3-4 hours... Please help.. I just can't see how to wire up the relay to cut something off, and turn something on at the same time...

dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: April 27, 2008 at 9:35 PM / IP Logged

I must be missing something here- just have to wire the switch to the same control line as the thermostatic controller, diode isolating if necessary. It'd be better if the relay was changed to use ground switching, if the thermostatic control can be used that way too.

Then the relay coil can be connected to a switched ignition source, and it won't run the battery down if the manual override is accidentally left on.

i am an idiot

Platinum - Posts: 13,672

Joined: September 21, 2006

Location: Louisiana, United States

Posted: April 28, 2008 at 4:02 AM / IP Logged

The thermo controller has a relay built into it. He wants to be able to manually turn the fan on also. Switch off and only the controller can turn fan on. Switch in the on position, the fan is on.

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