[PeteLeathersac]

It probably is the starter and replace/rebuild as req'd but don't forget rule #1 - always confirm problems <span style="text-decoration: underline">before</span> replacing any parts.
Failing batteries/alternators and other problems can create similar symptoms also a good battery reading means little being an internal failure may not show up until under load.
- Check oil level and if necessary that engine rotates Ok.
- Loosen alternator/fan belt to confirm alt spins freely also same w/ other belts/acccessories if present.
- Knock starter w/ a blunt hammer just in case it's stuck engaged.
- Visually inspect all system components/clean all connections and load test system to check starter, alt and battery.
- If no tester available, boost vehicle with <span style="text-decoration: underline">and without</span> the existing battery in the circuit - without necessary as a failed battery can drag the power down boosting through it.
- Still no-go, pull starter for visual and bench testing - replace/rebuild as req'd.
- Not necessarily in this case but it's best always check and confirm distributor advance and weights are free/not seized also check ignition base timing isn't too advanced.- Lastly is concern for a #'s starter and how it may disappear regardless of what the guy you send it to says, may be best buy a whole non #'s unit and shelf the original?

Best o' luck!
[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete