Biggest problem with the externally-regulated ("4-pin" as you put it)
alternators is finding a regulator to go with.
On the early factory-alternator cars that used this, it was mounted under the
back seat (same place as the regulator for a generator) and there had to be
three small wires between there and the engine compartment for connecting to
the alternator's D+, D-, and DF terminals. On a generator car like your `68
there aren't enough wires in the harness, so you'll either need to poke a
couple through or mount the regulator in the engine compartment.
The wiring isn't difficult. After removing the generator regulator you need to
bond all three of the large red wires which went to it together and insulate
the connection since it's "hot" at all times.
The alternator regulator has four wires coming out of it. One (blue) is not
used.
Brown goes to D-
Green goes to DF
Red goes to D+ ...the blue wire going up to the warning lamp on the dash needs
to be spliced into D+ also.
http://www.nls.net/mp/volks/schem/gen_alt.htm
http://www.nls.net/mp/volks/schem/altreg.gif
To use the internally-regulated alternator you still need to join the 3 big red
wires, but all you have to do is connect the warning light blue wire to the
green wire (that was DF on the generator) and connect the other end of the
green wire to the D+ terminal on the alternator.
The "bent" road-draft tube was adopted in 1968, same time as the warm-air
pickup elbow/hose was increased in size.
--- On Sat, 6/21/08, asad ishaque <[EMAIL PROTECTED]> wrote:
> From: asad ishaque <[EMAIL PROTECTED]>
> Subject: [vintagvw] Fitting an Alternator in my 68 bug.
> To: [email protected]
> Date: Saturday, June 21, 2008, 10:42 AM
> Hello Volks!
>
> Have a few questions again as I would
> finally be putting on a post 73 style alternator on my
> daily driven 68 bug.
>
> I have a three pin (actually with four
> connectors in total) alternator serviced and ready to go
> in.
>
> Meanwhile I also bought another three pin
> and a two pin alt. That makes me ‘rich’ with three
> spare alternators!
>
> Now the questions:
>
> -Is the two pin model better than the three pin one??? In
> that case I would like to put this on my daily driver
> instead of the ready three pin one.
>
> -I am quite sure the two pin has a builtin solid state
> regulator. How do I check this for good working state??
>
> -How do I connect the three pin alt to the wiring on my
> daily driven 68 which currently has a Japanese aftermarket
> generator slapped on (discussed here before).
>
> -Can anyone guide me in ‘idiot’s terms’ on the
> connections of both the two and three pin models? I shall
> look at the Bentley wiring diagrams tonight but maybe some
> pointers would help.
>
> -Is it possible for me to service the alternators at home??
> When I had the first one done at a local shop, all he did
> was clean the insides up, replace the bearings and did a
> Continuity Test between the winding and the armature. It
> looked like something I can handle myself. Any suggestions?
>
>
> Have a few holidays from work so plan to dive head first
> into this tomorrow or day after.
>
> Thanks in advance.
>
> Asad
> Karachi, Pakistan.
>
> PS: Btw while shopping for alternator pedestals I have come
> across two styles of breather pipe assemblies. One has an
> almost straight drain pipe while other has it with a couple
> of bends. What was this difference for??
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