I was starting my '91 F150 in gear due to clutch issues. I've bypassed the clutch safety switch and starts with toggle push button. Prior to replacing the clutch and brake pedal assembly, it was slow to turn over and quit. Now I'm getting no juice at all. I just replaced the starter solenoid because of it sticking.

 

A bit more information is required.
Do all interior and exterior lights still work ?
Could be a weak battery have you tested it ?
Could be corroded cables. Have you checked them ?
When you turn the key to start it, do you hear any clicks?

 

As stated, does not start with a key anymore. I have no power at all. Nothing works. When I flip the toggle switch, I get nothing. And yes, the battery is at 12.6 volts. As for the cables, I've seen nothing as far as corrosion.

 

I've always had earlier model Ford trucks. Nothing with a brain or fuel injected. Could I have burnt out the voltage regulator?

 

Hmmmm.....nothing works.....

Since it seems the electrical system for starting the truck has been modified, it's difficult to say what is wrong.

Since the battery has power, I can only suggest trying to trace where power is being interrupted.
- Check the main fuses
- check the grounding points
- check for power at fuses and relays.

 

Did you put the cables back on the correct terminals? If the "no power" issue started IMMEDIATELY after replacing the relay, I suspect not. Don't ask my how I found that out...