I have a new alternator for my stroker and it has no markings on it what so ever. It did come with a tag on the sense wire but that has long fallen off.
The seller no longer answers my request for help.
I think it is a Valeo alternator. The 2 pin plug has Audi/VW emblem on it, #1 blue wire and #2 Orange with a red stripe.
Is there a test to identify which terminal of the alternator is the exciter and which one is the sense?

 

Mike that looks like the alternator that Greg Brown sales. I just installed on MY 86.5 this week. He had the adaptor with the blue wire pig tail that I crimped onto my exciter wire.

 

That's saying the blue wire is the 'sense' wire getting battery status though the ignition?
That would satisfy the alternators conditions to run but not give a very accurate battery state of charge given the other load on that circuit?

Anyway, my gut feeling is that the blue wire is the sense wire.

Sounds like your car is very similar to my 'base' car, colour, interior, year, trans. I love it.

 

Mike you are correct. GB's is a Bosh internals and he had the outer case cut by a CNC design that matched the current 928 mounting locations. It fit great and now I get 14 volts at idle.

I ordered a 14 pin FOE from Rodger that Sean makes for he uses 6 gage marine wire for battery.

Hope you like your base 928 I sure like mine.

 

For whatever it's worth, that's not one of Greg's alternators.

 

I hook the original blue wire in the car, to the blue wire in my connector, for my alternators.
I don't use the other terminal.

 

Rob is right mine has the Bosh name on the back I don't see it on yours Mike. It does look like the connections for wiring.

 

Mine is definitely not stock fit. I made custom brackets and used a belt auto adjuster.
My compressor and alternator are in a fixed position, with belt idler adjusters.

 

I think that if I spin up the alternator, then feed 12v to each pin in the plug, I will get nothing by powering the sense pin [which normally sees 12v] and current output when I power the exciter pin?