It may be your battery is not as good as you think. It may also be your starter is failing. Most auto parts stores will check your charging system for free.
Starter solenoid? Battery not fully charged?
Is starter working?
If a 94 Thunderbird starter will not turn over, the battery may be dead. The battery should be charged with jumper cables.
Test the battery with a digital voltmeter. You should get a reading of 12.6 V if the battery is fully charged. If the battery is fully charged then you know the alternator is functioning properly and your problem is more than likely a defective starter.
It may still be the battery. If you just hear a click, it may be the starter is out. Make sure the battery is charged to the fullest. Sometimes the battery will have power but not enough to work the starter.
is it in park or neutral if not then will not start....is battery fully charged sometimes new batteries need charging before use....try the ignition relay sometimes they go on the blink....if battery is charged....remove ecu fuse for one minute and put back....this resets your whole setup
Check the battery and see if it is charged or needs to be changed. Check the battery cables Check the starter condition
Check the starter.
There are a few possibilities, Make sure the battery is fully charged then check to see that the wire going from the solenoid to the starter is clean and tight. Sometimes the connection gets corroded. If these check out I suggest pulling the starter and taking it to the auto parts store and have them test it. Always disconnect the battery first before you remove the starter.
Its a huge possibility your starter is out.
because its gone bad the starter solenoid is engaging the gears, yet the motor fails to spin
your starter might be going out does it click if so its your starter if not than maybe battery if not battery than its the alternator