Have a look at the pic below. The alternator is marked 15AC and the other numbers are 24 and 78.

Is there any chance that this is an internally regulated 15ACR unit or am I right in assuming that this alternator will need an external regulator?

you are right it will need a extrenal reg to work

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Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van

I Am fairly sure this has an internal reg

John is right,definetley internal regulator.
Had the same type alternator on my old deluxe
Felix

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1967 Morris mini Deluxe
1968 Buick Riviera
1979 HZ Kingswood
1979 CM Valiant
1982 Jaguar XJ6 series 3
2002 VX HSV
2013 Mazda 6
2018 Gt Mustang

Yep I agree, it's the Oz made one, is internally regulated.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Yep, internal regulator. The clue is where the hole for the two pin plug has only one pin. (I hope I am right! )

You are correct, pick a kewpie doll.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I was just guessing based on what Bosch did when fitted to Holdens. I figured that the Lucas Australia alternators were also fitted to Holdens and would have used the same types of plugs.

I'm confused

I have 2 types of 15AC alternators, the one shown in this thread and another with a plastic cover on the non drive end. This cover apparently covers several bits including a regulator.
So is one of these 2 types I have the external type of regulator unit
I thought the external regulator units had the regulator on the inner guard but if the type pictured and the other one I have described have the reg on or in the alternator then which one is an external

Cheers
Steve

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1964 998cc Cooper
1971 Mini K x 2
1972 Clubman GT

Steve

Not sure but morris has said the conection might tell the tale, I know that these alternators were fitted to Ford Escorts and some triumph sedans and in that case they did have external regs either the 4 or 8 TR same as the Mini with the 12 AC

I was always led to believe that the self regulating lucas units were called ACR but you live and learn

_________________
Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van

If I'm bored tomorrow after work would you people like me to pull the thing apart for a look-see?

Alternators fitted to Aust Minis
1St Type Had a half plastic cover at Rear External Reg,
2Nd Type No plastic cover at rear Internal Regulator
3Rd type Full Plastic cover at Rear Internal Reg

There are 2 different `15AC' alternators, this one and the early one with a 1/2 plastic end cover (as used on Mini-K and Cooper S).
That one is NOT internally regulated, what you can see inside there is the rectifier stack.

The later Clubby one with a full plastic end cover, <edit> the 16ACR, is internally regulated.

[edit] these line up with what John said above.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Ahhh, makes sense now

Cheers
Steve

_________________
1964 998cc Cooper
1971 Mini K x 2
1972 Clubman GT

There's some discussion, pictures and schematics in the following thread that is of interest to this chat.

http://www.ausmini.com/forums/viewtopic.php?t=46963&