I just went through this a couple months ago.

Here's my official procedure. Don't secure the antennae(s)... leave them loose so you can tape them to different locations on the fuse while testing. Plug a battery into a switch into a RX. Plug one servo in... test. Plug a second in... test. And on and on. If you get a glitch, you can try moving an antennae or two. Keep building slowly. Twist the wire on all your servo extensions. At least 1 twist per inch. If moving the antennaes don't help, the last component was the problem (either the servo OR the extension could be bad... try the same servo with a different extension). If the first servo is bad, the RX, battery, reg, or switch could be the problem. It's really a common sense building block approach.

For me... all said and done... the problem was my TX module. Go figure. The above procedure is still valid, though.

I NEVER let ANY radio component come within 10" of ANY ignition component (switches, batteries, leads, etc...). Personal preference, plus the ignition directions specify this. I figure the engineers have to know something about the product they put together with their own nuggets. If the shielding ever breaks down you're in trouble. Granted, with the motor off this shouldn't matter, but down the road it might.

Also... this Edge is known to come out tail heavy. That's why I bought an Extra instead. It's the same reason I won't put a DA-50 on a comp arf 2.3. There are other planes out there you can build correctly. Not that you need to hear this now.