Re: Need help with starter problem
So, I've had this same issue with my Ty since I bought it. Essentially, solenoid stays engaged for too long. Annoys the crap out of me.
It has the "ford" solenoid, autozone number f496, and the starter is a dl 9990s. Both had been replaced with no change.
Here's a picture of the solenoid.
What should I be doing? I did some searching, found a few things, but wanted to show the particular case I have.
I see ignition switch as potential and jumper should be removed on the solenoid.
If you don't have a mechanical issue causing it to hang up, it must be electrical since there's only two possible problems

.
Mechanical. I must admit at in all the years that I have worked on cars, I have never had to shim a starter motor that I have replaced. If it had shims in there, I just reused them and everything worked fine. I have never had to add or subtract shims. Since you have replaced the starter and are still having issues, I would look at the teeth on the flexplate. If they are chewed up or have serious burrs on the teeth, that could be causing it to hang up and not release immediately after you release the key.
Electrical. Connect the red test lead of meter to the triggering wire of the solenoid (small wire on the side) and the black test lead to ground. Set it to read DC volts. Have someone try and start the truck. You should only see 12 volts there as long and the key is in the start position. If the voltage lingers on after they release the key, something is "sticky" in the ignition switch.
Since you bought your truck "modified" I would be suspect of anything not stock on it. I repaired a turn signal on a Jeep for a customer that was all gummed up. So much so that she broke the turn signal handle off. Turns out her ex had taken it apart in the past and packed it with antisieze. Over the years, it had hardened up and turned into a gooey mess. Some people :roll:.