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thanks removed lx301 hei module and had it tested at local AZ, tested satisfactory. battery voltage at 12.6vdc, coil negative to ground lowered to 9.5vdc during starter drain while cranking with oem box.I charged the battery to 13 vdc and measured 10 vdc at negative coil terminal to ground during starter drain while cranking with oem box. re installed lx301 module and ohmed the connections: no resistance between coil positive and negative, but i had 3 ohms in the wiring for the pickup coil( red and green) wires.I cleaned these connections to 0 ohm resistance and routed these wires away from the coil to their lugs on the lx301 hei module.I lifted the wires going into the car from the clamshell terminal block.So the distributor pickup coil is wired directly to the lx301 hei module. I did not move the lx301 mount away from the coil yet, but did move the radio resistor away from the lx301 hei module. the car cranks and runs on the lx301 hei module. Next step is to wire the lx301 hei module into a previously failed oem box and keep everything in the controlled environment of the passenger compartment. thank you for the input.

I used an inline spark tester on number 5 plug and it appeared to generate a good strong spark. yes I am preparing for the failure of the oem module. I will test the module as your post stated. I bought it online inexpensively. thanks for the help.

thanks battery terminal voltage is 12.88 volts , coil positive terminal is same voltage with ignition switch on, starter not engaged. I wired the hei as per your previous post. I mounted on metal plate attached to the coil mounting bolt, using the supplied grease. I grounded the plate and the module separately to the ground for the afm. resistance readings to ground indicate very low or no resistance. I did unplug this upgrade hei and plug in my oem module and my car cranks and runs fine.The oem module was unplugged during the attempt with the hei module . i also rechecked ignition coil resistance and it is 1.5 ohms on the oem coil. I will reconfigure and measure coil voltage under starter load current draw with the hei module connected. my concern is possible coil saturation due to higher resistance primary coil winding, or my reluctor and pickup coil are not generating an adequate threshold voltage to trigger the hei module.

I have a similar problem, I installed a 4 pin gm hei with stock 78z coil. with 5 spark plugs removed from engine the installation will fire the installed plug as the distributor rotates. when I install the remaining 5 spark plugs, the hei will not fire any plug. I have a new distributor pickup coil, with 700 ohm resistance and generating a small ac voltage ( 2 vac or less). the coil primary resistance is 1.0 ohm. thank you in advance for help/ comments