So I just installed a Used SPX300 alt on my 2004 Z71 Tahoe. When I started it up, The battery light on the dash was lit up and it said "Battery Not Charging" in the Digital Read out. But my Voltage Gauge is reading just over 14v. I know the stock Alt has 4 pins in the female harness and this DC one only has 3 but the Factory male harness only has 3 wires in it. Did I miss a step somewhere guys?
What could this be? Any ideas? Thanks.
'04 Tahoe Z71
18" AQ HDC3.0 (x2), MB Quart Discus 2000.1 (x2), Custom 3 Way Front Stage, PPI P900.4, DC Power Eng SPX300
Optima Red Top (x6)