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  #16  
Old 05-25-2011, 06:10 AM
mazdaman mazdaman is offline
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Default Re: switched fuse panel

some led's are less that 12v so you need to use a resistor to bring the 12v down to the value of the led .
just for everyone's info you can get SPST relays with 5 pins , they have 2 87 pins , this allows you to run 2 items without having to splice the two wires together and then connect to the relay .
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  #17  
Old 05-25-2011, 06:29 AM
turbo turbo is offline
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Default Re: switched fuse panel

I haven't seen a schematic for the circuit, but I would imagine the resistor is in series with the LED to limit the current draw...
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  #18  
Old 05-25-2011, 06:30 AM
mazdaman mazdaman is offline
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Default Re: switched fuse panel

Quote:
Originally Posted by turbo View Post
I haven't seen a schematic for the circuit, but I would imagine the resistor is in series with the LED to limit the current draw...
that is correct
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  #19  
Old 05-25-2011, 11:49 PM
dga dga is offline
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Default Re: switched fuse panel

im using a 3.2 volt 5mm red diffused blinking led. not sure the rating of the resistor i used but im under driving it at about 2.9 volts. my relay is being shipped today with my order. im disassembling the current one i have now to understand the normally open concept if its circuit as opposed to a normally closed one.
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  #20  
Old 05-26-2011, 03:15 AM
mazdaman mazdaman is offline
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Default Re: switched fuse panel

This might help you out ,rather than take one apart , http://www.the12volt.com/relays/relays.asp
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  #21  
Old 05-26-2011, 06:22 AM
FireRanger FireRanger is offline
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Default Re: switched fuse panel

"NORMAL" is the state of the switch when the relay coil is de-energized (aka, when the relay is off).

OPEN means the switch is open, as in no connection.
CLOSED means the switch is closed, as in connected.

Normally open means that when the relay is off, the switch is open / disconnected.
Normally closed means that when the relay is off, the switch is closed / connected.

The standard bosch pattern relay you've been instructed to use has that numbered pin layout as described. 30 to 87 is normally open. 30 to 87a is normally closed.

Single pole means there is only circuit in the relay. This is most every relay used in the automotive world.

Double pole is essentially two relays in one. This is a specialty item not normally found in auto parts stores. It has two (or more) independent switched circuits in it.

Single throw means it is only on-off, therefore only an pin 87 or only a pin 87a. it could be NO or NC. Not bothj.

Double throw is the relay with an 87 and an 87a. It has a NO and an NC terminal.
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  #22  
Old 05-27-2011, 10:07 PM
dga dga is offline
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Default Re: switched fuse panel

repeat post...

Last edited by dga; 05-27-2011 at 10:09 PM. Reason: already posted answer
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  #23  
Old 05-27-2011, 10:30 PM
dga dga is offline
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Default Re: switched fuse panel

my order came in today along with my "normally closed" relay. that was my problem of using a "normally open" relay. when switched power is applied to a normally open relay, it will switch on terminal #87. with a normally closed relay when "switched" power is off, terminal #87a is powered. just the oppisite effect the relay at the store was not marked as to which type it was, so i assumed it would work in this application. thanks for all the replies as this helped me figuring out this issue.
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