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Andy, Andy, Andy..... .....that change in frontmount ignition coil voltage over time from 6.75 volts down to 4.5 is just EXACTLY what your OEM ballast resistor is supppost to do. Fords Better Idea..... .6 volt ballast resistor concept takes into account the starter loading effect on the original 6 volt weakknee wetcell battery that looses volts when it is trying to crank the starter over specially in cold weather with stiff oil and cold weakened battery. To compensate Fords Better Idea team came up with a metal that has the property of changing resistisance with heat. ie...when it is cold, it has low resistance, but as the current flows thru the resistance it actually heats up and as it heats up, the resistance actually increases and cuts down on the current flow and reduces the voltage to the ignition coil. Which is exactually what you are reporting. NOTE: this is all AUTO-MAGICAL and it is done on purpose. Now then, I concurr that your problem is electrical ignition related. You have been advised previously that you have TOO MUCH resistance in the ignition circuit. BUT you still need some resistance in the ignition circuit or you will burn out your 12 volt frontmount ignition coil. AGAIN I tell you, you want to measure about 10 to 11 volts (11.5 max) at the 12 volt frontmount ignition coil terminal. Any other value is going to give you sparkie problems, as you are currently experiencing. The 6 volt OEM ballast resistor mounted on the backside of the dashpanel is too much resistance. Change its value to about 1/2 by connecting another OEM ballast resistor side-by-side so that some of the current goes through both resistors at the same time. This is known as "parallel" connection. This means that each ballast resistor gets about 1/2 of the current that flow throught the ignition coil wire. Do it like I tell you and you will fix your sparkie problems. Do not second guess me because I am right..... ..Dell
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