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John,
I do electronic troubleshooting for a living. Usually, when I have repeated failures of a single module it's because something else to which it is connected is "eating" it. A likely candidate is a sensor that has too low impedence/resistence and therefore is passing too much current. Less common in recent years is voltage on the return line. It's amazing how dead a component will get with as little as -1.5V on a line that's supposed to be zero.
You also might consider getting a voltage regulator for the B+ going into the EC2. I don't have ready access to specifics right now, but regulats\or ASICs are a fairly standard item. It might be worth putting a scope on your charging circuit to see what kind of spikes the alternator regulator is actually allowing out on the +12V line. The RMS voltage (okay, I know that DC isn't actually measured in RMS) could be 14.2V but the regulator could still be allowing mSec length 20V spikes to pass through. ['course you have to get it *running* again to check for that :) ] A separate regulator for the EC2 might buy you the time you need to find a B+ problem.
I'd come out and help you look for it, but it's a 2000 mile flight, and I still have to work next week.
Regards,
Dale R.
From: "John Slade" <sladerj@bellsouth.net>
Date: 2005/05/20 Fri PM 08:51:53 EDT
...
The test went well. We plugged my EC2 into Buly's harness and immediately
got the NOP message on his EM2. We didn't check the spark, but the engine
would not fire at all. We then reinstalled his EC2. The NOP message went
away, and the engine fired up immediately on cranking. There we have it. My
EC2 is dead. Next question - why is it dead, and did I fry it when I
connected it to the old wiring? Have I corrected the problem by rewiring
everything? Of course, we could have tested my wiring by installing Buly's
EC2 in my plane. He didn't offer, and I didn't ask :)
...
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