Ground points vary from year to year but the main ones are from battery to block, strap from back of block to firewall, some small ones near the computer on the left fender and also one from battery to right fender.
You may have a starter solenoid that is worn out or a starter relay going bad. There is a ground wire going to that relay that can also give you a problem. To find it, you need to open up the power distribution center and check the ground at the relay itself, usually a double black wire (2) with a white stripe on them. Being that old, you may have replacement terminal ends as well. when cleaning them, you need to remove the wires from the attachment straps and clean there as well as the battery terminals.
Also, charge and have the battery load tested. Even a brand new one can sometimes have problems.
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how does it start in am? just click? does the head lights come on? when it is acting up?
it sounds like your starter is going bad. that's a classic syptom. it actually happens to my car but i haven't had the time to change the starter yet. sometimes this works. if you can locate and access the starter, tap on it firmly but not too hard with a broom stick while someone starts the car.
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