a couple weeks ago when I tried to start the truck it did not turn over.
I cycled the key back to the off position then the truck started.
Now it happens about 25% of the time.
Sometimes it will turn over a couple of times then stop, other times it will not turn over. If I cycle the key off & on it will start.

 

Check batteries. If original probably need replacing. I am doing mine tomorrow. Green eye wasn't there so getting weak. Noticed in colder weather it started a lot slower.

 

it's not the batteries, I have full power when it does crank.
Could be a relay or solenoid I'm guessing.