Need help with Mallory Uni-Lite distributor/ProMaster Coil combo

[MOTORHEAD]

So the ign system had not failed in 11,000 mi, and 3000 mi since alternator rebuild.
All you can do is replace the module and add the circuit protection device shown by Bob to protect the module from voltage spikes. The only way the ballast resistor can fail is if it opened, which is rare, but they are cheap so replace it if you want. I would make sure that all the components you replace are the ones recommended by Mallory.
The only other thing you can do is check for voltage spikes with an ocilliscope if you can find someone with one who knows how to use it.
If you have a battery master sw, make sure the ign is off before you operate the master.
All Electronic ign systems are prone to faliure, MSD, Pertronics, etc,etc, Solid state components don't tolerate voltages or amperages higher than they were designed to operate at. You might want to replace the coil also. An intermittent short on the primary side could take out the module.
I hear what you're saying about being stranded in the woods! I changed my boat engs to electronic modules and they failed on me once. Next day the points and cond went back in !! Carry spares !!!