> bought a 2 wire ac delco 7127.
Perhaps I'm confused, Frank. A standard 7127 (aka 10Si) is called a "3
wire" alternator, it has two smaller tabs for control signals and a big post
for the output. It is only grounded through the case (although there is
usually a spare post where a ground cable can be attached if you wish).
Looking at the back of the alternator), the left-hand tab is #1, which is
the output to the warning light on the dash. The right-hand tab should be
#2, the 'sense' input, which needs to see battery voltage. Optimum setup
IMO is to run a separate wire from the starter solenoid to this terminal,
but you can just jumper it to the output post if you want.
I've attached a scan from a GM manual with a diagram. As usual, if anyone
else wants a copy, email me offlist.
-- Randall
[demime 1.01d removed an attachment of type image/jpeg which had a name of AC
Delco alternator diagrams 150dpi.JPG]
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