Car will not crank over,no starter

The common cause could have faulty ignition switch.use test light to check if power going to starter if not check ignition fuse to starter.if power going to starter, more likely starter solenoid or starter faulty.if ignition fuse okay and starter and solenoid okay still no start problem could be in the ignition switch or inhibitor switch faulty.

This is the time period when GM had ign switch problems. Get a voltmeter and wiring diagram and check the IGN switch

Test Battery connections for continuity, if ok, use heavy duty test lead and connect live side of battery direct to starter motor.
If the engine cranks, the fault may lie between the ignition switch
and the starter solenoid.

Could be a defective battery, bad solenoid, or even bad ignition switch. When I was fixing cars, I always replaced the solenoid when I replaced the starter, but your mechanic might not have.

How about the ignition starter switch? It may have a bad a connection internally.

Did you replace the ignition lock, or switch ?
Will it crank if you jumper the solenoid for the starter ?

But those are ignition parts. If the car won't crank, there is a problem between the battery, ignition switch, and the starter.
Try this, Darren: With key on, does your dash light up, gauges working and check engine light on? Turn key to start. Do you hear a click form the area of the starter? If you hear the starter solenoid click, and you know the battery is charged up good, then likely the starter is out, and needs to be taken off for testing or replacement. But that is assuming that the battery cables and their.connections are good and allowing full battery power to the starter.
If you hear no click in start, turn the headlights on and watch their intensity while someone turns key to crank. If the lights dim noticeably and no cranking, then the starter is bad or needs testing. If the lights don't change intensity when key is at crank position, then possibly the starter solenoid is bad or the circuit from ignition switch to the starter solenoid is not allowing current to pass. Take off the small wire (brown, I think) from the starter solenoid and see if it has power when key is in crank position. If it has power, the starter has to come off-it or the solenoid is bad. If no power on the solenoid wire with key in crank, then the circuit from ignition switch to the solenoid will have to be checked. There are at least a couple of components in that path- one is the starter relay, another is the neutral safety switch (or clutch switch on manuals). Also if no power on the solenoid wire, check the 30 amp fuse in the power distribution center by the battery. It may be fuse # 10, at least it is on a '97 Jeep. Heck, check all your fuses while you're at it.
Good luck.

It sounds like the ignition switch again, thats the only source for the starter solenoid to power up. I'd disconnect the power to the starter solenoid (ignintion input small wires, not the battery cables). Jumper the battery again, check for power on the solenoid for the ignition feed, if it has power then yes the ignition switch is bypassed somehow. I've seen issues with the back side of the connector going to the ignition switch where the wires are bare from being flexed, the insulation breaks and wires touch each other. Carefully check the condition of the wires going to the ignition switch, if good replace ignition switch again.

make sure you have power to the b+ terminal of starter. Also make sure you got power to the ignition terminal on starter with key in the crank possition. With key in the crank possition check that power is being tranfered from solenoid to motor. If all these check ok replace starter. If no power in the ign(small gage wire on starter) possible ignition switch or p/n safety switch. If no powere on B+ check battery, battery cablem fusible link.