Hi their, i got an onan ccka cast iron engine on my 450 commercial 2 cyl, and has no spark. I changed the points and condenser, and it worked for a while and stopped firing. I tried a new coil and still, no spark. I am getting power to the coil, so that is ok. I saw this tower grey colored thing that went to the points, and think it is a resistor or something. I have no schematis so can someone help me figure out what this thing is, and what wires go where. Im lost. Thanks mike.