Starter staying engaged 94 150 ford pickup 300 6cylinder

Does the starter stay engaged? If so it will be your starter relay. I've got a 76 f100 with a 390 n it it was doing the same thing

check to see if the starter is staying engaged after use check and make sure of the starter clearance it may need shimmed make sure no wires are rubbing causing the starter to engage at the wrong times

solenoid may be sticking. Have someone start the car, if it sticks tap the solenoid with screw driver handle. If that stops the starter, replace the solenoid. If it were me, I wouldn't bother testing it and just replace solenoid.

Try removing the starter and putting a small amount of grease on the bendix gear drive. That is the part you can see in the nose,with the gear. Not on the gear, grease the spiral shaft.

2 problems, first you have bad starter or starter relay for starter staying engaged, keep alt plugged in has nothing to do with starter staying engauged, to test starter relay, jump at relay bat + post with red/bk wire on solonoid, if cranks over without staying engaged, then not relay or starter but rather in your ign switch, ford had bad problems with ign switch some years ago doing that

The starter solenoid is stuck. Replace it.

starter is staying engaged its not kicking back.. you got a faulty starter..

shim the starter it sounds like it is staying engaged to the flywheel try shiming the starter

The starter relay on the fender is the most common cause of this condition. ,It is on passenger side feder in the engine compartment, it is round and the positive cable of the battery goes to it,