Starter motor problems?

[carrierbarry]

After a long hard winter I tried to take the carrier out today. But the starter motor seem to have jammed.
Removed it from carrier ((Ha ha!!)
Tested on bench all seams to be OK. Dog moving easy.

But before I strip it down.
With good connections and full battery it did'nt seem to have the power to turn engine over. Is there a clutch behind the dog when it moves forward?

Barry