If you have your alternator in the stock (passenger side) location for
67.5, the swap isn't too difficult. You want part number 7127SE (self
exciting), or you can get 7127 without self-exciting and make a wire to
run from the #2 prong on the two prong connector to the + post on the
back of the alternator. The SE is a little more expensive and you're
not as likely to find it in stock. The part number is followed by -3,
-6, -9 or -12, which refers to the location of the two prong connector,
like a clock. -12 is good, so is -3. -6 points down and -9 points to
the engine so those two are bad choices.
There are many wires coming out of the stock alternator; most of them
go to the voltage regulator, NOT the battery. Only the one large(r)
wire goes to the battery via the ammeter. I believe there is also a
ground wire, which is not needed on the one wire conversion.
I recall someone saying a 60 amp Z ammeter fits in the 67.5 gauge, but
I believe you'd have to upgrade the whole wiring harness to get it to
support that high amperage, so for right now I'll assume you're not
going to do any of that.
So, connect the alternator in place of the old one. If I'm correct, it
will fit right in and even the pulley should line up, although the
pulley may be a bit smaller. This assumes the late and early roadster
alternators are the same; the one wire alternator fit right in the
stock location of my '70 but the heat destroyed the internal regulator
(late cars have alternator on driver's side and smog pump on passenger
side).
Anywhoo, wrap up the voltage regulator wires and the hot wire going to
the old alternator. You will not use any of them. Run a new 8 gauge
wire (wire and crimp-on connectors at your local NAPA auto parts store)
from the + of the new alternator to the + of the battery.
Your ammeter will no longer read properly. A voltmeter is easy to
install and gives you essentially the same thing - the health of the
charging system. They are under $20 for a cheap one and much easier to
install than an ammeter.
Take a look at my alternator pics at
<http://www.ofoto.com/I.jsp?m=58213969203&n=435884809>. Mine is on a
late car so the alternator is pushed forward, but you get the idea and
the wiring would be the same.
--- SLBESQ@aol.com wrote:
> hi all
> happy new year! may the new year bring all of us peace and
> prosperity.
>
> because it's a holiday, i have some time to spend on the roadster. i
> have
> had to jump it lately, so i wanted to see what the alternator was
> putting
> out. (battery mounted on passenger side of the trunk) it wasn't
> good (12.8
> at idle, and drops from there to 6 or 7 with the lights on). i
> wanted to
> upgrade to the "one-wire" delco, so i guess now is the time.
>
> is this something that i can do myself? i mean, with my obviously
> limited
> knowledge and skill. what else must i change? how is it that only
> one wire
> comes out of the delco and five or so come out of mine? do i need
> new
> mounting hardware? is there a "kit" for doing this swap?
>
> thanks a million for all your help.
>
> steve
> 67.5 H20
>
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=====
Adam
'70 1600 SPL311-28181
http://www.picturetrail.com/abend
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