I'm only seeing a 2-wire connection on the alternator diagram for an '03 Diamante.
The RD/WT wire comes from fuse 8 in the engine compartment relay box, and the WT wire comes from the generator relay in that same box. The generator relay passes power from fuse 12 in the interior fuse box.
2013 Chevrolet Volt - Saves enough in fuel to pay for itself!
2003 Cadillac Seville STS - The winter "beater", it uses the Volt's fuel
Re: Deciphering Alternator wires
#4727612 04/15/1810:22 AM04/15/1810:22 AM