I have a JD-B that will not start, spark seems to weak to none. Mostly none. This B has a Wico XH mag. The ground out stud is shorted to ground at all times. When I started to check it out, I found that the primary windings of the coil read dead short on my ohm meter. Seems to me that it should read a few ohms, and not dead short. Can anyone tell me what it should read? Dave