73 Headlight-door motor not stoping

[Nils <nils@xxxxxxxxxxxxx>]

Hi

The motor to open my concealed headlightdoors works fine when I turn the 
lights on and opens the doors.
But if I switch it off, the motor keeps running (doors closing-the little 
weel underneath keeps spinning) and
wont stop 'till I disconnect the wires.
After that the doors move up a quarter, like a spring forces them to.
Any ideas how  to fix that ?
Is there an 'end switch' inside that motor, so it 'knows' when to stop ?

Thanks
Nils