69 GMC C1500 Stepside Alternator Issue

[Steeveedee]

Minimum voltage for the charging system is 13.5 Volts. It is not charging. Is this identical to the case before the alternator and regulator were replaced? BTW, a batter at 12V is basically considered dead. It should be at 12.6V to be considered fully charged. Can we see a picture of your setup? Here is a wiring schematic for your truck. Never mind that it shows a V-8, the charging circuits are the same.