6v systems are usually positive ground so the neg side of the coil is the "hot" side and the pos side goes to the points.
Here's some wiring diagrams for you:
this one is for 6v pos ground View attachment 291095
First off you really need to find a service manual and it is it positive or negative ground.You wire it different like daliant stated above.
If you had a bad ground either positive or negative ,when turning over the motor it would rob the power from the coil.
CHECK YOUR GROUND !!!
And like alan627b said is the distributor turning?
I wired up a 6v tractor with a one wire alternator and converted it to 12v...changed bulbs to 12V and drop resistor to distributor and works like a champ.
Good luck,
Martin
