Alternator wiring help

[Anglocanadian]

I would really appreciate opinions whether I have the wiring correct.


Bottom left to starter and battery
Bottom right ground strap
Top to charging light

This is a complete rebuild so I am using a Painless wiring loom which i might end up regretting, but the original was such a dirty mess

Thanks

[Synchro Joe]

https://forums.pelicanparts.com/porsche-911-technical-forum/315590-84-911-alternator-wiring.html

https://forums.pelicanparts.com/porsche-911-technical-forum/401341-alternator-wiring-advice.html

[Anglocanadian]

As I'm not using the Porsche harness I wanted to know the destination of the terminals not which color wires attach .

[john walker's workshop]

+ is 12V, - is ground, the other is D+/61, the energizer wire from the dash light. Do you see those marks?

[pmax]

Originally Posted by Synchro Joe

https://forums.pelicanparts.com/porsche-911-technical-forum/315590-84-911-alternator-wiring.html

Careful there, the labelling in that first pic is wrong.

[boyt911sc]

The factory three-terminals alternator has a triangular configuration.

Top corner…….. #61
Bottom left corner………..D-
Bottom right corner……..B+

Unfortunately, some rebuilt alternators that do not have the terminal identification stamped near it. So this is where the problem and confusion begins.

There are some rebuilt alternators that have a different configuration and missing identification marks. A simple test is to identify the GROUND terminal. Only one (1) of these terminals or posts has ground continuity to the alternator body. Test and confirm. That’s how to locate the NEGATIVE terminal.

Once you identify the location of the GROUND terminal, clockwise is #61 followed by B+. Anyone has a specific test to differentiate #61 and B+ terminals? Thanks.

Tony

[Anglocanadian]

+ is 12V, - is ground, the other is D+/61, the energizer wire from the dash light. Do you see those marks?

Thanks, just needed confirmation to put my mind at rest before i put the "lid" on.
I will check the marked - terminal for continuity just in case.

[917_Langheck]

Let's start with the correct orientation.... at least, the regulator is at the top in my car...

[Anglocanadian]

Let's start with the correct orientation.... at least, the regulator is at the top in my car...

From all the searches i have done the consensus seems to be regulator is closest to the case at the bottom.

[917_Langheck]

Originally Posted by Anglocanadian

From all the searches i have done the consensus seems to be regulator is closest to the case at the bottom.

Interesting. Mine was at the top and was original as far as I could tell when I replaced it. A Google photo search finds both orientations, but I see more up then down as installed. Hardly scientific or "correct." I don't think the electricity cares, however. 🙂