I have restored a 1939 9N*8417* it's pretty original and am excited to start it but...with new 6v battery it is very sluggish, in fact only about 10-15 cranks and the battery can't do any more. Reading some earlier forum posts I tried connecting the 12v battery in my 2011 Acura MDX to the starter only and after a blip of a spark nothing happened. I've tried different grounds to no avail. My tractor starter has just a single connection sticking out of the top-no relay or other connections. I need to get more and livelier cranks to start this thing. Is it the old starter or some circuit protection in my car to prevent the starter from vigorously cranking the engine?