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  Author    Right - join Part A to Part B etc, etc, etc  (currently 69,800 views)
Graham Bichard
Posted on: July 9th, 2022, 09:46:52 Quote Report to Moderator
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Craig, All,
Looking at the circuit diagram I think I can 'extract' the info for only a second fan.  But am I correct in thinking when comparing your diagram with what I've done, the relay pin 85 and 86 polarity is swapped around?
That is - where I have a +ve feed, you've got a earth?
Hope that makes sense.
Cheers.
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Graham Bichard
Posted on: July 9th, 2022, 10:31:23 Quote Report to Moderator
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Proposed relay:
https://www.autoelectricsupplies.co.uk/product/169
With holder:
https://www.autoelectricsupplies.co.uk/product/179/category/37

Using a simple in-line fuse/holder and a single pole, single throw on/off switch - something like this:
https://uk.rs-online.com/web/p.....BwE&gclsrc=aw.ds
(Not sure if this switch is IVA compliant but chosen as an example)

Am I heading on the right path with these items?


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Craig Smith
Posted on: July 11th, 2022, 09:19:53 Quote Report to Moderator
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Quoted from Graham Bichard, posted July 9th, 2022, 09:46:52 at here
Craig, All,
 But am I correct in thinking when comparing your diagram with what I've done, the relay pin 85 and 86 polarity is swapped around?
That is - where I have a +ve feed, you've got a earth?
Hope that makes sense.
Cheers.



Ordinarily the way that you wire pins 85 & 86 would make no difference to its operation (though 85 is commonly referenced as "coil ground").  However, the relay that you have chosen has an internal diode across pins 85 & 86, and therefore would have to be wired as per my diagram with 85 going to earth.  Alternatively you could go for a relay without a diode:  CBS part number 140201 and wire it as per your diagram.  

All that you are doing with 85 & 86 is energising a coil, and it makes no difference which way the current flows with a non diode fitted unit.

Other items all look fine.
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Graham Bichard
Posted on: July 16th, 2022, 14:04:46 Quote Report to Moderator
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Thanks Craig.  I didn't realise I'd selected a relay with a diode - no need for that I think.  So I'll look to keep it simple (of course) and get the bits ordered.
Cheers.
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Graham Bichard
Posted on: July 23rd, 2022, 14:47:01 Quote Report to Moderator
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Received through the post this week:

Relay & holder, plenty of black & red 17.5Amp cable (I did think about trying to match the MPi loom wire colours, but I'll be marking these cables up with a tag so this was an easier option), plenty of spare connectors.
I purchased the maxi fuse size inline fuse holder as it was only a few quid - I haven't as yet been able to locate a regular size blade fuse inline holder rated at 15A as yet, but will keep looking (until such time as I do the wiring) as it will be more convenient only carrying one size (not rating) of spare fuse.
 
I bought the switch from RS (along with some cable covering to try and make it look like a 'proper job')- I think it'll be okay (for IVA), the edge profile being similar to the other rectangular rocker switches, but I might hide it away under the dash for the test and mount it correctly on the dash afterwards.

Re-reading Mr Dickens book, he mentions he prefers not to wire the fan through the ignition (albeit he controls the fan with a temperature switch).  I'm tempted - in the name of simplicity in my case, to revisit whether I wire the fan directly i.e. leave out the ignition switch.

Also received the mounting feet for the second fan, which I'd forgotten to order with the fan!
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Graham Bichard
Posted on: July 23rd, 2022, 15:41:18 Quote Report to Moderator
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Okay - so after a bit of reassurance here please.
This is a photo of my starter motor area, in particular the red +ve connection.  (Not the clearest of photo's I'm afraid)

Am I correct in thinking it is from here that I take the power to connect to the Relay (connection '30')?
Thank you.
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