Posted by Dave in CA [162.158.255.241] on Monday, June 05, 2017 at 11:33:35 :
In Reply to: 1968 w300 ignition question posted by Steve in Tucson [162.158.69.84] on Saturday, June 03, 2017 at 20:40:57 :
Check the schematic. I recall that the start circuit temporarily bypasses the ballast resistor to give the coil a full 12 volts, and a hotter spark. When you back off the key to the run mode, the power to the coil goes through the ballast resistor and is less than 12 volts.