It seems to be getting a spark. It seems like something is ground ing out somewhere. the speedometer needle bounces when I an cranking it, but it just won't start. I can hear the starter. I have had several problems with the rad fan motor not coming on right before this. I tested the fan motor by jumping the wires with a little piece of wire, bypassing the switch. Ever since then the car hasn't started. Could I have possibly fried a wire by doing this. I checked the ground wires from engine to chassis and they look okay(not broken, but slightly dirty).
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Sounds like the sending unit has an intermittent short to ground. Unhook the the wire from the sending unit, and see if the needle stops jumping around. If it quits jumping around, replace the sending unit. If it still jumps around, you have a bare spot somewhere on the wire and it is hitting ground which will cause the needle to jump. Cut out the bad part of the wire and splice in a new section. That should fix it.
could be a worn speedometer cable that may be loose or stripped, causing it to catch only ever so often, or slip occasionally, making the needle jump, or bounce, also check the ground for a good conection, a loose ground can cause the same problem
Have you checked the fuses? Without knowing all the details I would guess fuse or ground out somewhere along the line. Also chk to see if the needle is stuck under the pin. Although unlikely it does happen. I hope that helps you to solve your problem.
It sounds like a faulty voltage regulator, faulty alternator, or a bad ground. Try checking the voltage output with a voltmeter, preferably an analog (needle) type. If the needle is "bouncing" then the output of the alternator is not "steady". This voltage variation, if severe enough, could cause your electronic meters (such as your speedometer) to perform erratically.
Also, if you have performed any aftermarket modifications to the electrical system (such as high power stereo installs, etc), temporarily disconnect these and see if the problem resolves. A stock alternator for this car only puts out around 70-80 amps. It doesn't leave much of a margin for additional current draw from high power add-ons.