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  #1  
Old August 10th, 2011, 06:55 PM
jijalicious
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Jiman Khosravan
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Question Relay Smelay

Ok.... I want to replace the relay that turns on my electronic fan that cools the radiator....

The current relay is a CAT 115-1516 which is like $35 online.. only found 1 site.

I saw this...

http://www.radioshack.com/product/in...rodsPerPage=60

From the picture... the connections should be...

85 Ground
86 Thermostat
87 Fan
30 Battery (12 V +)

So once thermostat is hot, it sends ~13-14V giving current between 86 and 85, thus...magnet will get turn on and allow 87 to connect to 30 thus turning on the fan?

Is that right or did I miss the exit by 6, maybe 7 states?

And anyone know where those numbers... 85, 86... came from?

~Jij
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  #2  
Old August 10th, 2011, 07:31 PM
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Neill Thornton
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Sounds like a run of the mill bosch relay setup. They have had those numbers since the beginning of time.

Check out this page, I have used them many times for relays....

http://www.rallylights.com/SearchRes...?CategoryID=55

You are right on how the circuit works. Put in the correct voltage on 85 and 86, and the contact between 30 and 87 close. Some have an 87a that's connected to 30 when there is no voltage, some have two sets of contacts, etc.
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  #3  
Old August 11th, 2011, 12:36 PM
jijalicious
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Jiman Khosravan
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Thanks Neill...

See if you can pinpoint this one....

I want a relay switch that turns on and off when a momentary voltage is thrown at it...

So it would toggle between on/off everytime 12V hits it.

And I'm being clear enough? :/

~Jij
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  #4  
Old August 11th, 2011, 12:48 PM
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thomas
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Quote:
Originally Posted by jijalicious View Post
Thanks Neill...

See if you can pinpoint this one....

I want a relay switch that turns on and off when a momentary voltage is thrown at it...

So it would toggle between on/off everytime 12V hits it.

And I'm being clear enough? :/

~Jij


Most relays are wired for "open at rest" which means they only allow power to go through once you send the low amperage 12 volt signal from your switch. Once you do this it will then close the circuit and allow the 12 volts (higher amperage) to pass through. Once the switch is no longer sending the 12 volt (low amps) through it will open the circuit

closed circuit: means you have power
open circuit: means you dont have power
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  #5  
Old August 11th, 2011, 01:45 PM
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mark kellgren
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Quote:
Originally Posted by navydevildoc View Post
Sounds like a run of the mill bosch relay setup. They have had those numbers since the beginning of time.

Check out this page, I have used them many times for relays....

http://www.rallylights.com/SearchRes...?CategoryID=55

You are right on how the circuit works. Put in the correct voltage on 85 and 86, and the contact between 30 and 87 close. Some have an 87a that's connected to 30 when there is no voltage, some have two sets of contacts, etc.

And make sure you don't F'up the fan polarity!
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  #6  
Old August 11th, 2011, 01:45 PM
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Neill Thornton
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Hmmm... so you want a "flip flop" type relay. Not very common at all.

You can use a circuit board like this:

http://www.mcmelectronics.com/produc...K-I-9-/28-5115

Then have your real relay controlled by that board. The circuit board would take your input in, and then provide voltage to the relay when it should be on. You would have to figure out some kind of enclosure for it.

------ Follow up post added August 11th, 2011 10:46 AM ------

Quote:
Originally Posted by Overlander View Post
And make sure you don't F'up the fan polarity!


My only defense there was it was installed by the PO....
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  #7  
Old August 11th, 2011, 04:00 PM
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Paul McConnell
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Quote:
Originally Posted by jijalicious View Post
Thanks Neill...

See if you can pinpoint this one....

I want a relay switch that turns on and off when a momentary voltage is thrown at it...

So it would toggle between on/off everytime 12V hits it.

And I'm being clear enough? :/

~Jij

Sounds like you're looking for a 'Latching Relay'

This UK supplier sells one -

http://www.vehicle-wiring-products.e...lays.php#latch

Click image for larger version

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ID:	41019


They do ship outside of the UK, but I'm guessing that you'd probably get one cheaper from a US auto electrics supplier.

.
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  #8  
Old August 11th, 2011, 04:14 PM
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navydevildoc
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Neill Thornton
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Hey, there you go!

Just so you know, Latching relays are not normally like this. So beware if you find one somewhere else. Usually they either need two buttons (on and off) or latch on until all power is removed.
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  #9  
Old August 15th, 2011, 03:09 PM
jijalicious
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Jiman Khosravan
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Awesome.
I found this one in LA...

http://cgi.ebay.com/DEI-611T-12-VOLT...item20ac8677f4

What do you guys think?

~Jij
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  #10  
Old August 15th, 2011, 03:52 PM
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Quote:
Originally Posted by jijalicious View Post
Awesome.
I found this one in LA...

http://cgi.ebay.com/DEI-611T-12-VOLT...item20ac8677f4

What do you guys think?

~Jij

It looks like a useful bit of kit, but... they don't say what current it'll switch.

They say that it's a "solid-state switch" - which possibly means that it can't switch an accessory-sized load and you would have to use it to switch a relay.

I would contact the seller to confirm what size load it'll switch before parting with any $$$

Paul.
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