MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

RV8 Alternator
Posted by: Bobbydm
Date: July 08, 2010 03:28PM

Dear Experts....

Guys I have a 1978 wiring loom in my Uk car and have upgraded to an RV8 alternator. I have to be honest and say electrics are my weakness, i have read lots of guides and made sure I have the correct gauge wiring for the extra amps but have no idea which wire goes where on the alternator.

if anyone has the RV8 alternator on their car can you please advise me which connection goes where!!! Please.... The connections are 3 studs (all different sizes) and 3 L shape plugs. I don't want to start guessing and starts sparks flying!

Thanks for your help!!!


Simon Austin
Simon Austin
Surrey, British Columbia
(107 posts)

Registered:
10/23/2007 01:44AM

Main British Car:
1977 MGB V8 / 1970 MGB GT V8 project Rover 3.5 / Rover 3.5

Re: RV8 Alternator
Posted by: Simon Austin
Date: July 12, 2010 12:53PM

Here's a couple of photos of my RV8's alternator. If you need more detail, let me know. Not sure about the 3 L-shaped plugs. I don't appear to have those. This looks like the OEM alternator as the date matches the car.

Cheers
Simon
RV8 alternator 1.JPG
RV8 alternator 2.JPG



Edited 2 time(s). Last edit at 07/12/2010 01:08PM by Simon Austin.


Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

Re: RV8 Alternator
Posted by: Bobbydm
Date: July 16, 2010 06:30AM

Simon thats great thanks. Looks like mine isn't an RV8 alternator even though a specialist sold it to me as one.

The L-shape fittings look like the ones that come from the black block marked 02-94. Mine doesnt have these blocks at all!

I will post some photos as well but for now does yours have any letters next to the terminals. For example just the letter B or anything like that.

Thanks again!
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Simon Austin
Simon Austin
Surrey, British Columbia
(107 posts)

Registered:
10/23/2007 01:44AM

Main British Car:
1977 MGB V8 / 1970 MGB GT V8 project Rover 3.5 / Rover 3.5

Re: RV8 Alternator
Posted by: Simon Austin
Date: July 27, 2010 01:21AM

Sorry it took so long to get back to you, Rob. I don't venture on here very often. I'll look in the morning at the terminals and see what's on there.

I'll post some photos of the alternator wiring on my Rover 3.5-powered MGB as well. Maybe its alternator is similar to yours. For now, here's a shot of it during the build.
DSC00369.JPG
DSC00561.JPG


Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

Re: RV8 Alternator
Posted by: Bobbydm
Date: July 30, 2010 05:05AM

Simon,

That would be great. The alternator on your B v8 looks exactly like mine! In fact the car looks the same colour!

Looking forward to hearing from you!


Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

Re: RV8 Alternator
Posted by: Bobbydm
Date: July 30, 2010 05:09AM

I should also mention on further inspection mine does have the black blocks that are the same as your RV8 alternator.

Any markings from yours will be sure to help.


Simon Austin
Simon Austin
Surrey, British Columbia
(107 posts)

Registered:
10/23/2007 01:44AM

Main British Car:
1977 MGB V8 / 1970 MGB GT V8 project Rover 3.5 / Rover 3.5

Re: RV8 Alternator
Posted by: Simon Austin
Date: July 31, 2010 01:55AM

Hmm....interesting. Looks like a bit of a hybrid you have there. Just so I have this correct; your alternator looks like my grey V8's one but has the black blocks of the RV8?

FWIW, the V8's alternator plugs directly into the stock '74 wiring harness I used to wire the car. That may or may not help with identifying it.

I will get you some photos asap. I'll also look in the RV8's shop manual in an attempt to sort out its wiring and the plugs.

Cheers
Simon



Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

Re: RV8 Alternator
Posted by: Bobbydm
Date: August 05, 2010 03:56PM

Some pics of the alternator!

http://i814.photobucket.com/albums/zz70/bobbydmfh/P1030343.jpg
http://i814.photobucket.com/albums/zz70/bobbydmfh/P1030340.jpg
http://i814.photobucket.com/albums/zz70/bobbydmfh/P1030339.jpg
http://i814.photobucket.com/albums/zz70/bobbydmfh/P1030338.jpg
http://i814.photobucket.com/albums/zz70/bobbydmfh/P1030337.jpg


Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

Re: RV8 Alternator
Posted by: Bobbydm
Date: August 05, 2010 03:58PM

It is clearly from the RV8 now that I have it off the car. i just want to confirm the locations of each wire if thats possible.


Moderator
Curtis Jacobson
Portland Oregon
(4577 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: RV8 Alternator
Posted by: Moderator
Date: August 05, 2010 04:15PM

Nice photos!


Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

Re: RV8 Alternator
Posted by: Bobbydm
Date: August 05, 2010 05:06PM

I was worried about how big they are but its the only way to get the detail!
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DiDueColpi
Fred Key
West coast - Canada
(1365 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: RV8 Alternator
Posted by: DiDueColpi
Date: August 05, 2010 05:09PM

Hey Rob,
The black blocks on the alternator are noise supressors for your radio etc. The loose one in the photo should go to the W terminal. This terminal won't be used on your car. It is a phase tap and is usually used as a tachometer feed for diesel applications. The B+ goes to the battery or starter terminal through the heavy brown wire. I would not use the one in the factory harness. Upgrade it to at least a 8 guage wire to be safe. The D+ goes to the brown yellow wire. This wire is for voltage sensing and turns the idiot light on in the dash.
That should do it.
Cheers
Fred


Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

Re: RV8 Alternator
Posted by: Bobbydm
Date: August 05, 2010 05:20PM

Fred....you are my hero! I have already upgarded the cable thanks to the Roger Williams book!

I will do this tomorrow and then its off for a UK MOT!!!

Just a pic of the nearly finished car!

http://i814.photobucket.com/albums/zz70/bobbydmfh/P1030198.jpg


DiDueColpi
Fred Key
West coast - Canada
(1365 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: RV8 Alternator
Posted by: DiDueColpi
Date: August 05, 2010 05:41PM

Nice car Rob. What are the side vents from?


Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

Re: RV8 Alternator
Posted by: Bobbydm
Date: August 05, 2010 05:54PM

Very well spotted. Its the only real modification that stands out from being original! They are from a works Healey 3000. The inner wings are also vented to allow air flow for cooling and to prevent the nose lifting at speed!

http://i814.photobucket.com/albums/zz70/bobbydmfh/P1030187.jpg



Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

Re: RV8 Alternator
Posted by: Bobbydm
Date: August 05, 2010 05:56PM

Not to everyones taste and a bit overkill but I have always wanted a works Healey and this as close as I can get for now!


rficalora
Rob Ficalora
Willis, TX
(2764 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: RV8 Alternator
Posted by: rficalora
Date: August 05, 2010 09:43PM

I like 'em.


apexhunter
Alan Van Reed
Boston, Massachusetts
(12 posts)

Registered:
07/29/2010 01:30PM

Main British Car:
1971 MGB Rover 4.2

Re: RV8 Alternator
Posted by: apexhunter
Date: August 09, 2010 07:51PM

Bobbydm,

You must be stoked ...... almost complete ..... great build quality ....... I also like the vents ......... We all have AH cravings ... and very difficult to find a sound one to restore any more ....ones that are done have decent are fetching big money ...are the wheels panasport? what size?

Alan
Boston


Bobbydm
Rob Moore
Surrey, UK
(13 posts)

Registered:
01/29/2010 09:41AM

Main British Car:
1972 MGB v8 (1979 shell) 3500cc

Re: RV8 Alternator
Posted by: Bobbydm
Date: October 12, 2010 06:15AM

Well finally she has an MOT, new steering rack fitted over the weekend and passed yesterday!

Time to get the engine run in!

Thanks for the comments Alan, and yes I am over the moon! I got a wrap around hardtop for it so it can be used a lot more over the winter!
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