Oh! One other thing...if you don't hear at LEAST a click when you hit the key...I'd suspect a switch or wiring connection problem. Anywhere from the ignition switch to the solenoid via any OTHER switches in between (auto trans neutral safety or clutch pedal start safety switch) which ever may be applicable in your case. You should be able to apply 12V + right from your battery to the small gauge wire spade connector post on the solenoid to rule out a circuit / switch problem. Make SURE you're in neutral when you try this though.
'99 Grand Vitara JLX, 2.5L V-6, 4WD, 5 spd std, '00 "Limited" leather interior
'72 Nova. SB, TH-350, PB, PS, A/C.