Have power to the selinoid when key is off, but no power when the key is on

Start with the battery. It must have at least 10.6 volts under load to turn over the starter.

Your wire to the starter selinoid has some how bypassed the key switch or the selinoid is bypassed or mechanically stuck closed. The selinoid is a magnetic switch that closes the curcuit for the larger starter wire You must to make sure you are connecting the wires to the correct spots.
source:obd2 tools car diagnostic tool

both of the small wires to the solenoid go threw safety switches start with the one on the clutch/brake pedal

You have bad connection. Check all cables from battery on. If you ohm meter, they cheap,go from battery to solenoid.(12v) From solenoid to starter, may haveto turn the key. Check all wires good connections, You change a lot parts, back track your find the problem. GOOD LUCK

There are a few things it could be. You need to do a check of the coil, safety switches and the ignition switch. You can check the starting solinoid (coil) by jumping from the hot terminal on the main contacts to the terminal that gets its power from the ignition switch (caution, do not go to the ground terminal if it is a four wire solinoid) . If it turns the engine, then you need to check the ignition switch. This is easier with an electrical multimeter. Remember to check the safeties. I have observed that the seat safety switch is the most common electrical component to fail.

I hope this helps.

hello ther
Are the lights on the dash on or not?
if yes check your grounds what you can find.Mainly at the battery.It could also be the electrical part of your ignition switch,
let me know
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proporsche

TAKE THE BATTERY OFF THE ONE SIDE OF THE SELINOID POSTIVE ONE COMMING FROM THE BATTERY KEY ON AND TOUCH IT TOO THE OTHER SIDE OF THE SELINOID WHERE THE CABLE GOES DOWN TO THE STARTER IF THE STARTER ENGAGES WITHOUT THE SENOID SO JUST A COUPLE OF SECONDS DO THIS STATER ENGAGES SELINOID BAD IF THE STATER DON'T ENGAGE THE STARTER IS BAD

Make sure you have pwr to the starter. There may be a fusible link in the starter circuit which is blown. Starter selinoid may be defective. Is there any 'clicking' like the starter selinoid is getting any power?

check the other end of the ingnition wires to the key switch and from the key switch to the selinoid.

replaced circuit board. Problem solved