2000 Pontiac Sunfire will not start

Load test the battery and double check its connections if okay -your possibilities here could be the starter, park and neutral switch and ignition switch

Is there a way to load test the battery if you can't get it started? Also I ran a jumper wire to the starter and it turned over several times.

On the switch there is four wires on the top plug, I believe they are two reds and a brown and a thin green one, are they all suppose to have power? I am reading 12 volts on three of the four.

I got 2 reds and 1 yellow-okay do this find the P/N switch on top of the transaxle remove connector-hold key at start position check for power on the yellow-let me know if you have it or not

ok I tested the yellow wire at the p/n switch connector with the key on and got 0.78 volts.

That's not enough to activate the starter solenoid-test the ignition switch

I tested the yellow wire at the switch and got 0.95 volts. I pulled the plug and tested the pin the yellow wire connects to and got 12 volts. Also when I unpluged the connection from the ignition switch I didn't notice I still had the key in the on position and the radio came on. When I plugged the connector back in the radio went out.

Whick key position are you checking this yellow wire On or Crank position-You suppose to be checking it while in cranking/starting position

I am checking it at the cranking position.

I am trying to test the individual wires in this ignition switch plug. I grounded the black wire and made a jumper wire that I could plug into the individual pins in the plug in. I tested the yellow wire and got 11.5 volts. The pink wire was .78 and the orange wire I got 0 volts. I am not sure where the pink and the orange wires go.

There's no ground wire on the ignition switch oneof the of them should only have battery input power and the rest has power depends on the position of the ignition switch-Replace the ignition switch

I tested the conductivity between the 4 wires and grounded metal on the steering column with the wires unpluged from the ignition switch. This is what I got:

Yellow - .0L (no change from not touching anything.)
Orange - .002 (after cycling through several numbers)
Pink - 1.640 (after cycling through several numbers)
Black - .001 (after cycling though several numbers)

I am still not sure what the problem was but I was tracing the wires that come off the ignition switch and totally dismanteled the dash to trace the small black wire to the instument gauge cluster, disconnected the instrument guages, tried to turn the key to check for voltage and the car started. I turned the key off and plugged in the instrument gauges and tried to restart the car and it started. I replaced the dash and tried again and it started. I finished replacing everything I took off at it started fine. I only thing I noticed was a light out in the instrument cluster. I took the car for a drive and while I was driving the light in the instrument cluster came back on. As of right now everything seems to be working fine. Thanks for all your help.