Reply to "Questions: Indicator Lights and 3G Alt wiring!"

Nor'easter,

Pre-First: I think my alternator is working properly. GEN lamp is not perhaps.... But basic operations is sound, just the needle flapping in the breeze is unsettling!

FIRST: let me apologize for not documenting any of the alternator pulley work I did when I went thru this early this or late last year..... I didn't even take pic's for myself! Apparently I was to deep into hoses and other crap!!!


One VERY important thing that I ran into with these pulleys "on the Ford G3 alternator that I have"(!!!) is that when used as found, there are only enough threads sticking out of the pulley to get a nut on about 2-3 threads....Not quite the engagement you want for something on the front of your engine!

I had to take some XXX amount off the rear flange IIRC, in order to get proper pulley alignment and gain good thread contact and allow a lock washer...for my tastes!

My alt came with a modified "C9AF" pulley, but a quick look in the parts book indicates that the "C9" pulleys are the same size, at about 2-3/4" diam as the C5AF versions. I think I am now running a modified C5AF-10A352-L that I pulled off of a rebuilt alternator I had laying about....as the one that came with the car, had slightly damaged sheave (groove) from belt slipping perhaps.

If you put a stock pulley on, it will be too far forward for proper alignment. I had material removed from the rear mounting area.

For some reason, it seemed like the original C5 pulley was mounted backwards and perhaps shortened...... fuzzy memory.

I would expect the Boss pulley to need some material removed also.

Here is a rundown on pulleys from the Ford Master parts book for you: (part numbers "as marked" to the best of my knowledge!)

C5AF-10344-K,-J2 2-3/4" Dual groove (which we can't run due to only having two groove pulleys...where to put the AC belt?

C5AF-10344-L, C5TF-10344-G 2-3/4" Single groove
C9AF-10A352-B, -A2 2-3/4" Single groove

C5AF-10A352-H "HiPo 289" 3.9" Single Groove

D1ZF-10A352-A 1970 Boss 3" single groove

D2OF or D2AF-10A352- 3.15"

D1AF-10A352-A or AA 3.15" same as D2 version.

According to the parts book, these last two pulleys were used on LOTS of cars, Mustang, Cougar, Fairlane etc in 71 and 72 on 302, 351, and 429/460's! Perhaps even on the Pantera if the alternators came on the engines to DeTomaso!

But! What is bizarre, is that I haven't "noticed," nor can I find any of these 3" pulleys on ebay or via Google search........seem to be only C5AF and C9AF versions......and the others have evaporated!!!

So to boil that all down, you have 2-3/4" pulleys most common, 3" hard to find, and 4" which is available in repop form.....!

Pic of my engine with C5AF-L pulley.

......I wonder why people just don't upgrade to a good Motorcraft 65-75 Amp alternator with a solid state regulator and be done with it all!?? Do we need 95A? Just thinkin....