I have a 2000 GT that will not start, engine doesnt turn over or anything. Replaced the starter already an found out its not getting power to the starter. Swaped the starter relay and it starts, after it gets warm tho it will not start back. If I swap the relay back it starts again. That was working for awhile but now it is a dead no start. I can push start it but something in the electrical system is messed up any ideas. Already tried starter, clutch switch and relay, im out of ideas!
I am sure that you meant to say "no power to the starter solenoid" as the starter has power all of the time.
Let's start by checking the basics for trouble shooting a "no-crank" problem. Is the battery clean and the terminals clean and tight? Is the grounding strap from the motor to the frame in place? Are the other grounds around the battery in place?
There is a large terminal on the bottom of the Battery Junction Box (BJB). Is it clean and tight? There are a couple of smaller single wire connectors under the battery. Check these for good connection.
Check fuse F1.3 and F2.6. Make sure they are clean and the terminals are clean and tight.
Has this car been flooded?
Next we need to determine is what the power state to the relay is. In other words, are we getting power to the relay or not.
Confirm that if +12 volts is sent straight to the starter solenoid that the starter engages. Be safe.
Confirm there is +12 volts to the BJB LG/VT wire. Jump the LG/VT & BN/PK wire and confirm if the starter solenoid engages. If not, the problem is in the wire between the relay and the starter.
Confirm there is +12 volts to the WH/PK wire when the ignition key is in the "start" position. If not, the problem is upstream of the relay.
That's enough tests for now. Post the results and will go from there.