14 replies to this topic

[Frankcutler]

Hi there.

This relates to my 87 Mini City. The charge light would go out on initial start but when the revs came down it would then come on and just flash on and off. More revs made no difference. I took the alternator apart and found that one of the alternator brushes  had a broken copper braid connection wire. Assuming that this was the problem and because the alternator has no identification of any sort I took it to the local auto factors and a set of brushes appeared.....which fit.  I think it must be a 16ACR?? 

  

The problem now is that I can't find the reminder note for the connections!  Can anyone please send me a diagram or photo of the connections?

 

This is a two wire regulator....so should one of the brushes go to earth and the other brush to the regulator yellow lead and diode pack?

I can't find any evidence of a link from one brush to earth or have I been careless and lost a link wire?

This is what I have got:

 DSCN4251.JPG   56.46K   29 downloads

 

 

Regards, Frank

[ACDodd]

There should be a link fron the regulator to the brush it's nearest to.

Ac

[Frankcutler]

Just to clarify.. Do you mean the black wire from the regulator or some other wire? There are only two wires on the regulator

Frank.

[ACDodd]

No wire, it's a solid link bar that connects the brush to the bolt that holds the voltage regulator in place. The red wire from the rectifier needs to connect to the same brush as the yellow wire from the regulator.

Ac

Edited by ACDodd, 15 May 2014 - 09:53 PM.

[Frankcutler]

Thanks Ac your help is much appreciated. Will keep you posted on results.
Frank

[Frankcutler]

Yes that works well. Alternator output is 14.7V which I think is about right. If not please let me know.
Frank.

[ACDodd]

14.7 is a touch high. If you are using a calcium battery perfect.

[Frankcutler]

No I am not, it's a standard battery. Do you think that I may still have an alternator connection problem? Or the regulator is not regulating? What voltage would you expect?

Regards. Frank

[Frankcutler]

This is how I have it connected now.

Attached Files

•  image.jpg   69.49K   14 downloads

[ACDodd]

That is connected properly. Usually the reg voltage is about 14.4 to 14.5.

See how the car runs and keep an eye on the electrolyte level. You may find you need to top up.

Ac

[Frankcutler]

Thanks

[KernowCooper]

As AC has mentioned above 14.4v is the threshold where Sulfuric Acid stats to boil, if the voltage is 14.7v I'd suspect the voltage regulator Frank

[Frankcutler]

Thanks Dave. I will replace the regulator as you suggest.
Frank.

[ACDodd]

See what the battery voltage is when the engine is hot. It should be a touch lower.

Ac

[Frankcutler]

OK Ac ..............will do that and thanks for the tip, It may save me a bit of work.

 

Going to start new topic on rattle under front footwell....getting quite alarming!

 

Regards, Frank