1999 buick cl getting no power at all

have you checked voltage and ground, anywhere? Make sure battery has a full charge and battery connections all good, all ends, not just at the battery. Check for voltage at the fuses, some fuses, hot all the time, some go hot with the key on, test both ways, use a test light to check for voltage. Haver you tried jumper cables or jump box to see if it will crank? I [posted a diagram for starter circuit, The B termninal, comes from battery, hot all the time. The S terminal goes hot with key in the crank position and is wired through transaxle range sensor. Grounds are important also, the starter motor grounds through the engine block. any testing at starter, make sure transmission is in park or neutral and parking brake is set. Vehicle can't move.