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sounds like you need to get the battery checked as well as wire connections between battery and starter. 12.52 is marginal as when you crank the starter the voltage probably goes below 10.0 volts and when you jump it the voltage is at the proper level to allow cranking.
From the ignition switch there is a yellow wire that is for the starter. probe it when trying to start. If you have no voltage replace the switch. Also, I believe there is a fusible link in the wire by the starter. It will be a different color than purple. Probe on the back side of it to see if there is voltage at start up. If so, replace with the smae color link.
it sounds like you may have a bad starter solenoid and the extra voltage from the jumper vehicle is enough to complete the circuit through the solenoid to allow the starter to turn over.sometimes the solenoid contacts get very dirty and can`t complete the circuit on its own without a jump.i think these have a bosch starter system on them and you can replace the contacts only in the solenoid.
The starter solenoid is bad or the ignition switch is bad. Check the solenoid to see if it is getting power. If the solenoid is getting power then the solenoid is bad. But if the solenoid is not getting power with the key in the start position, then the ignition switch is bad.
starter relay,ignition switch,park switch.need to use a volt meter and start at the starter,see if you have at least 12 volts.if there is have the battery tested.does your head lights come on?next no voltage, go to the fuse box under the hood and check for (2) 12 volt powers with the key on and a good ground.if ok replace the relay.next move the trans shifter to neutral with foot on brake and try and start if it starts you need park switch.if not next is the ign.switch to test,you will need to locate the starter wire and check for voltage when starting if none replace the ign.switch hope this helped.also the alternator has nothing to do with the cranking of the engine on this car.
Check the safety switch on trans to see if the power is getting to it for the start circuit. If this switch gets old and worn it will drop the voltage so much that it wont start. If it does have voltage then check the wiring to the solenoid for voltage from the battery. The solenoid wire is easy to remove and test with test ligt and a second set of eyes to watch the light when you turn switch
if there is another solonoid itll be in line with the main power cable coming from the starter.follow the starter power cable from the starter to the battery if you dont see anything inline it probably doesnt have one.your problem could also be a ground problem........try running a wire from the starter case to the neg batterty terminal........a set of booster cables is the easiest way to do this.........dont short the pos and neg terminals though