LR> My '77 Ford F-250 as far as I know still has the same module in it
 LR> that it rolled out of the factory with.  There was some kind of test
 LR> you can do on it with anohm meter and a 500watt heat lamp but I don't
 LR> remember the specifics.  The main problem that that particular module
My Haynes manual for my '80 Ford F-150 has details on some sort of test you 
can do on the module... though when I followed it after my module went out, 
it tested good.  Go figure.  In my case, I always had problems with the 
engine dying, but could always start it right back up, every few days since I 
got the truck.  One day, after I'd had it almost 2 years, it just died going 
down the road and wouldn't start again.  No spark or anything.  Got it towed 
home.. and it started right up!  Died again a minute later, and wouldn't 
start.
I replaced that pesky module on a hunch though, and it's never died from lack 
of spark since then.  The module for mine is mounted on the inner wheelwell 
(which is plastic), but it's almost 2 feet away from the engine.  Not much 
room on the firewall.
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