School me on relays...

[CJL 10+ year member]

So I found a diagram for An application that im doing and it shows me how to wire up a relay. But in the diagram it shows a relay with the following posts numbers.......

----87

85-87a-86

----30

Now I have about 3 relays at home but on the back of 2 of them it shows these following posts numbers...

----87

86-87a-85

----30

and the last one show the same as above but has no marking of ''87a'' in the middle,just a 87. Mind you the middle post is not used in this app anyway..

With that being would I have to buy new relays that match the post number markings in the diagram?

Click to read more...

 

[rocky 59 5,000+ posts]

87 is your switched on or off, 30 your switche if you will, 85 i believe is power and 86 ground

 

[CJL 10+ year member]

So the post numbers wouldnt matter?

 

[Cameron_B 10+ year member]

87 is your switched on or off, 30 your switche if you will, 85 i believe is power and 86 ground

So 87 and 30 is the coil?

 

[rocky 59 5,000+ posts]

i believe so yes

 

[Stephen_c 10+ year member]

85 -

86 +

30 is your source

87 and 87a are you outputs

85 and 86 are the coil add a switch to either to control the relay.

 

[DBBOOM 10+ year member]

http://www.parts-express.com/resources/relays.html

Schooled.

 

[Stephen_c 10+ year member]

87a is your normally closed output

87 is normally open

 

[Cameron_B 10+ year member]

OK, so 85/86 is the coil/trigger and 87a n/c 87 n/o

 

[CJL 10+ year member]

85 and 86 are the coil add a switch to either to control the relay.

So that means I can can use the relays I have now?

Basically, It dont matter which side 86 and 85 are on? They do the same thing?

 

[Cameron_B 10+ year member]

85 is connected to the ground of the triggering voltage.

86 is connected to the positive 12V of the triggering voltage.

Taken from P/E

Test it by connecting this way, if you hear a "click" when voltage is applied it works.

 

[blue200sx 10+ year member]

it doesnt matter which side 85 and 86 are on and it doesnt matter if 85 or 86 is positvie or negative. just know you need a ground on one and power on the other to energize the relay.

 

[Cameron_B 10+ year member]

Just checked with a spare relay, blue is right polarity doesnt matter.

 

[CJL 10+ year member]

Ok the reason for asking is because in the diagram in the link below,notice the 85 is on the left and 86 is on the right. and the relay I got at home the 86 is on the left and the 85 is on the right.

http://64.85.6.129/extrainfo/diagrams/14301_INTREPID_CHRYSLER%20COUPE%20and%20SEDAN%201%20WIRE%20JBS%20UNITS.pdf

And notice here in this diagram below the 86 is on the left and the 85 is on the right(like the one i got at home). So that made me think there were 2 different type of relays.

http://64.85.6.129/extrainfo/diagrams/18164_INTREPID_CHRYSLER%20PARKING%20LIGHT%20DIAGRAM.pdf

 

[blue200sx 10+ year member]

yeah but it doesnt matter. which side 85 or 86 is on they are both single pole single throw relays.