[TR] tr3 alternator

Randall tr3driver at ca.rr.com
Mon Jan 25 15:43:08 MST 2010


> 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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