1995 Grand Prix Turn Key Doesnt Start

Check your starter relay in the fuse box

Might be a bad starter solenoid

Have you checked the ignition switch itself?

Depends. When you turn the key to start, the only thing that has power is the outside lights and the starter relay. In the on position everything but the starter should have power. So that will have to be sorted out. If some things are dead with the key on, either you have lost power between the battery and the fuse box, or the key switch is faulty.

Better check with a test light for power to the small wire that goes to the starter from the key switch. If no power need to check for a neutral safety switch or fuse. Or the starter you got is bad. Alternator will not cause not to crank over

Used parts such as starters and altinators don't last. It might **** but it sounds like you need to buy a new starter,altinator, and battery. Or just start with buying one at a time.

Did this happen after you put the new battery in?
I have run into where people just put a new Pep Boys or Kragen or whomever battery in and had issues afterwards. Soemtimes the terminals don't tighten. The bolt will be as tight as you can get it without stripping and the terminal can still be moved. The battery terminal hole may be too shallow not alloing the bolt to go deep enough.
Things will work until you try to start, The starter will draw a lot of juice and cause the loose terminal to arc and lose connection.

Now if this was happening before you replaced the battery then it may be the starter orits circuit. Hook a test light to the starters small "S" terminal and try to start. If the ight comes on its a bad starter. If no light then you need to trace that back. Manual transmission should have a safety switch on the clutch pedal. Automatic will have a neutral safety switch on the transmission (right side where the gear selector hooks to).

But that sudden loss of power makes me thing there is a loose connection arcing. If not at the battery then check the under hood fuse and relay panel.

First thing i would check is the security system. If the battery is good, and it feels like everything is normall except it just wont crank. It could be the security or the starter. Put your key in and try to start it, when it doesnt start, look for a light on the dash that says SECURITY this is a dead give away and you could find all the answers you may need on this link http://vatspasslockpasskeysecurityhelp.yolasite.com/

I had a similar problem where the battery was ok but there was no sound from the starter and also there no lights on in the dash when the key was turned. Checked the fuse and checked wire from the fuse back to the ignition switch. The wire from the fuse was ok in fuse box but had no voltage at the ignition sw. The was also no voltage to terminal 30 in the starter relay. Ran a new wire from the fuse to the ignition and it fixed everything. Check for voltage at terminal 30 on the starter relay

By the sound of it. Can you check the Starter Fuse if its still good. you can visually check this by simply taking out the fuse and inspecting if the fillament is still whole. Any breaks in the filament would mean a dead fuse. To find out which fuse to check look at the underside of the fuse box cover and there should be a diagram.

Another potential problem would be the ignition switch. if thats the case there are a lot of ways to go about this but the cheapest way is to simply create a new lead to the starter and add in a push button switch (if done right it would look really cool since most exotic cars are actually started with a push of a button rather than a turn of the key)