7 replies to this topic

[matt050990]

Hey all,

 

I am installing an additional fusebox into my mini to allow extra accessories to be added.

 

I have got a relay to go off the ignition switch to control some of the power out but bit confused on 1 prong. 

 

Picture below of what I have got,

 

 IMG-20150213-WA0000.jpg   31.19K   4 downloads  IMG-20150213-WA0001.jpg   43.3K   7 downloads

 

 

From what I can figure out this is what they all mean....

 

30 - Constant power in

85 - Earth

86 - Ignition power in (from ignition switch)

87 - Power outlet when ignition is on

87A - For when coil is not powered.

 

87a is the one that's confusing me, what is this for? do I need to connect anything onto this? if so what?

 

Ideally I want some constant power & some ignition switched power coming through the new fuse box.

 

Any help much appreciated.

 

 

Much ta

Matt

[Craig89]

Hi Matt.

The relay that you have shown is used to switch the same supply between 2 loads.

85 - 86 is the coil, this does the switching, when this is energised the other contacts are switched.

By rights constant power should be on number 30. And this will give constant power on number 87a when the coil is not live. If you switch the coil using the ignition then the power will move from 87a to 87 so you will loose the power to whatever was on 87a.

Hope this helps, Craig

[matt050990]

Cheers Craig,

 

So if I'm understanding correctly I can only have power from either permanent live or switched not both?

 

 

Cheers

Matt

[Craig89]

Yes mate that's correct. For your permanently fed circuits just permently feed the fuses, no need for a relay. Then use the relay for just the ignition live circuits

[matt050990]

spot on, cheers mate

[Icey]

Some noddy information that may be stating the obvious but....

 

For future reference (e.g when replacing it) the shorthand for that relay is SPDT - Single Pole (one input), Dual Throw (the input is switched between two outputs).

 

If you aren't using 87a you can go for a 'SPNO' relay - Single Pole, Normally Open (one input, one output which is 'open' - not connected - when the relay coil isn't powered).

 

The same naming applies to manual switches.

[Cerberus]

Some noddy information that may be stating the obvious but....

 

For future reference (e.g when replacing it) the shorthand for that relay is SPDT - Single Pole (one input), Dual Throw (the input is switched between two outputs).

 

If you aren't using 87a you can go for a 'SPNO' relay - Single Pole, Normally Open (one input, one output which is 'open' - not connected - when the relay coil isn't powered).

 

The same naming applies to manual switches.

 

Or just 4 pin instead of a 5 pin,

[Icey]

 

Some noddy information that may be stating the obvious but....

 

For future reference (e.g when replacing it) the shorthand for that relay is SPDT - Single Pole (one input), Dual Throw (the input is switched between two outputs).

 

If you aren't using 87a you can go for a 'SPNO' relay - Single Pole, Normally Open (one input, one output which is 'open' - not connected - when the relay coil isn't powered).

 

The same naming applies to manual switches.

 

Or just 4 pin instead of a 5 pin,

 

 

 

But that could be SPNO or SPNC - pin count may not always be a reliable way to tell them apart.....