Need to "tap" starter motor....

[I Leak Oil]

Probably developing a flat spot between the brushes and commutator. Pretty common. Get it rebuilt sooner than later as the poor connection will cause a higher draw and more damage.

Yes, do the usual checking of the connections and grounds first.
.....and never rule out the battery just because the lights work. Starter requires far more juice!

[Star27buck]

Sounds like the solenoid is sticking. It's the lump on the side of the starter housing. It's the electrically activated switch that sends the large amperage juice to the starter motor.

[bugeye88]

Thats what I was thinking.... a solenoid sticking. The iron core of the solenoid sticks in the bore of the solenoid. Rust and other gunk does this. Used to be more common in old cars and this was the temp fix.. give it a good tap. Granted it could be the starter itself, but the solenoid is more likely.

Cheers,
Rob
Bugeye88