Alternator / Regulator confusion

[Sharkbitemarky]

Hi,

76 911 Coupe 2.7

I believe that my alternator is not charging a few more checks to do to confirm however, looking at potential replacements for my 911 603 120 04 (14V 75A) internal regulator ! alternator, I don't understand how I can also have an external voltage regulator 911 603 206 13 on the CDI panel, can this be correct ?.

Any clarification much appreciated
Mark

[proporsche]

show us the picture what you have..most likely external reg....does the alt shaft has a slott for 8mm allen or not? If not it is external reg if yes it is internal reg....

Ivan

[Sharkbitemarky]

Originally Posted by proporsche

show us the picture what you have..most likely external reg....does the alt shaft has a slott for 8mm allen or not? If not it is external reg if yes it is internal reg....

Ivan

Many thanks, do not have a pic of shaft at this time.

Cheers
Mark

[proporsche]

well..it is internal regulator..what is the trouble...?charging should be at least 12,8-14,2 anything less or more it is not good regulator.
Once you remove it have a look at the shaft for wear from the brushes...to insert the regulator back into its place use a thin feeler gauge...let the brushes slide on top of it into the alternator..

[Sharkbitemarky]

Originally Posted by proporsche

well..it is internal regulator..what is the trouble...?charging should be at least 12,8-14,2 anything less or more it is not good regulator.
Once you remove it have a look at the shaft for wear from the brushes...to insert the regulator back into its place use a thin feeler gauge...let the brushes slide on top of it into the alternator..

2 problems

1) I don't understand how you can have both an internal & external regulator

2) Not charging at battery however, I may have left the red lead off the starter motor and can't check that right now, I suspect that when I first started the car after 4 years of on/off reno I had a fuel leak so I quickly pulled the Negative terminal off the battery don't ask why just the closest thing I could think of doing, I am assuming I could have damaged the Alternator then !?

Thanks
Mark

[proporsche]

the regulator is there simply ..it was not removed ..do you have it plugged in??

[Sharkbitemarky]

Originally Posted by proporsche

the regulator is there simply ..it was not removed ..do you have it plugged in??

Yes I do have it plugged in ! ?

[proporsche]

that is not correct..unplug it and see the charging..most likely not good...than again what is plugged in there picture..off it will help

[Dr J]

Someone may have replaced the alternator with the newer version that has the internal regulator. In which case, the external regulator is superfluous. When my alternator went south, I did just that.

[Flojo]

SEV Marchall, external regulator
Mostly early cars up to last SC 1980/81

VALEO, internal regulator
mostly Carrera 3.2 onwards.

[Sharkbitemarky]

Thanks for the help

It looks like there are 2 bits to the external voltage regulator e.g. the large alloy component #91160320613 (Voltage regulator) and a smaller Alloy component with 3 terminals & a 3 wire lead below it which plugs in to the larger component (Voltage Reg) with 3 terminals. What is it I should be disconnecting from What ?

Cheers
Mark

[proporsche]

all of it should disconnected.....basically, do not plug in neither of them... the regulator or the Radio [interference] suppressor

[Sharkbitemarky]

Originally Posted by proporsche

all of it should disconnected.....basically, do not plug in neither of them

As the car was running fine when I obtained it 4 years ago and very original from my records/pics both plugs were were plugged in when the CDI cover was removed for the first time !

However, back then I had no reason to check if it was charging as, it started well and the battery seemed to keep its charge.

I guess what I still don't understand is, if the External Voltage Regulator is removed completely how does the circuitry that requires Regulated Voltage get it from now, I think some sort of bypass or wiring mod would be required.

I'll be with the car all day tomorrow and can do some more checks then. Guy currently putting Headlining and Windscreens in, getting close to driving it again

Cheers
Mark

[proporsche]

no additional wiring bypass has to be done ....it is all connected at the type of alternator....just make sure if you replace the regulator DO not plug it in .....

Ivan