With out knowing what coil you have and whatn resistor your using and how long it takes that resistor to warm up to start dropping the voltage to the coil i am shooting in the dark here . When i do a 6 to 12 change over i use a 6 volt coild usually the stock coil and add a resistor off a older Chrysler product and it takes a bit for the voltage to drop off down to around 6-8 volts . Your feed wire to the resistor should be nothing less then a 14. ga. wire from the push pull ing. switch and you sould have at least a 10 Ga. wire supplying juice from the started pole from the battery to the dash . . JT's has a couple good ideas also .
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