Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: MX5 Alternator wiring
ash_hammond

posted on 28/9/15 at 11:04 AM Reply With Quote
MX5 Alternator wiring

Guys.

I would like some help please to get the wiring correct on the alternator in my MX5 engined kit. The old engine (pinto) had two wires the 12v output of the alternator to the battery and the 12v energizer wire via the charge light.

I now have this mx5 alternator which has three terminals.



I assume the left hand threaded connector is the 12v output to the battery, one of the pins is the connector for the 12v energizer wire, but I'm not sure what the send pin in the connector is for. Looking at the below diagram, you jump a wire from the output to the second pin in the connector. I don't understand why this is required, but I would like to. I assume as well, it will earth via the engine as per everything else.



Cheers
Ash

[Edited on 28/9/15 by ash_hammond]

[Edited on 28/9/15 by ash_hammond]







.: www.mac1motorsports.co.uk | www.m1moc.com :.

View User's Profile Visit User's Homepage View All Posts By User U2U Member This User Has MSN Messenger
theconrodkid

posted on 28/9/15 at 11:36 AM Reply With Quote
http://www.yorbalindamiata.com/images/wiring/90sys.pdf

page 5,one goes through the bulb,the other is ignition controlled





who cares who wins
pass the pork pies

View User's Profile E-Mail User View All Posts By User U2U Member   theconrodkid 's Aim   theconrodkid 's Yahoo
ash_hammond

posted on 28/9/15 at 01:11 PM Reply With Quote
Thanks.

Just to make sure i understand the diagram and these questions should stand me in good stead for the future.

The little arrows under the fuse point the flow of electricity?
On the alternator, the solid back dot (White wire) represent the bolt connector and the other two represent the plug?
Does it matter with way around the wires go into the plug? Looking on google now for an image.
Any idea why the alternator requires the 12v supply on the white/green wire?



Thanks

[Edited on 28/9/15 by ash_hammond]







.: www.mac1motorsports.co.uk | www.m1moc.com :.

View User's Profile Visit User's Homepage View All Posts By User U2U Member This User Has MSN Messenger
Smoking Frog

posted on 28/9/15 at 02:14 PM Reply With Quote
quote:

The little arrows under the fuse point the flow of electricity?

No it's a symbol for Connector
quote:

On the alternator, the solid back dot (White wire) represent the bolt connector and the other two represent the plug?

Yes

Sorry don't know the answers to the other two questions.

I'm also using MX5 bits but not the clocks so wired my charge light as below. Wire colours and fuse ID maybe different.
Charging Circuit
Charging Circuit

View User's Profile View All Posts By User U2U Member
coozer

posted on 28/9/15 at 02:20 PM Reply With Quote
Any idea why the alternator requires the 12v supply on the white/green wire?

That will be to energise the stator/magnets into generating electricity.

Without it the alternator may just spin and not make any juice.

[Edited on 28/9/15 by coozer]





1972 V8 Jago

Midlana when I find the space...

View User's Profile Visit User's Homepage View All Posts By User U2U Member
ash_hammond

posted on 28/9/15 at 02:48 PM Reply With Quote
quote:
Originally posted by coozer
Any idea why the alternator requires the 12v supply on the white/green wire?

That will be to energise the stator/magnets into generating electricity.

Without it the alternator may just spin and not make any juice.

[Edited on 28/9/15 by coozer]


OK.... I think i have understood my own confusion. I agree that the 12v is required to energize the alternator, i thought this would come from the 12v going though the charge light. Then when the alternator is charging, this light goes out. Well that is how it was wired on my Pinto.

So what i now understand is:

The 12v is required direct to the alternator, this will entergize it.
12v is required to the charge night and then connected to the alternator and the alternator will earth it making the bulb light up.
The bolt connector is the output and goes to the battery.

Roughly the same idea as the pinto, just a slightly different implementation.







.: www.mac1motorsports.co.uk | www.m1moc.com :.

View User's Profile Visit User's Homepage View All Posts By User U2U Member This User Has MSN Messenger
rdodger

posted on 28/9/15 at 03:23 PM Reply With Quote
Hi

Is this on a MK1 NA or Mk2 NB?

The MK2 had an ECU controlled alternator. The MK1 isn't.

If you have mk2 engine/ecu you need to swop to a mk1 alternator.






View User's Profile View All Posts By User U2U Member
ash_hammond

posted on 28/9/15 at 03:37 PM Reply With Quote
From a MK1 91 model







.: www.mac1motorsports.co.uk | www.m1moc.com :.

View User's Profile Visit User's Homepage View All Posts By User U2U Member This User Has MSN Messenger
ash_hammond

posted on 29/9/15 at 09:45 PM Reply With Quote
All sorted.

I had done what i thought would be the issue. I had mistaken terminal for the charge light and the output to the battery. I also got hold of another diagram that told me which pin was for the charge light.

Note to self, look at a wiring diagram first.

Thanks for the assistance.







.: www.mac1motorsports.co.uk | www.m1moc.com :.

View User's Profile Visit User's Homepage View All Posts By User U2U Member This User Has MSN Messenger
Mudchute

posted on 6/7/18 at 12:01 PM Reply With Quote
Hi all,

I'm currently(!)ly stuck on this issue with my build. I'm using a mk1 MX5 alternator as above but with my own loom and instruments, an Acewell 7659. This doesn't use the alternator to feed its battery light so I'm stuck wondering if I can simply run the white/black wire to a switched 12v source without a light inline.

Can anyone help at all?

View User's Profile View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [ 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.