Mailing List flyrotary@lancaironline.net Message #22091
From: John Slade <sladerj@bellsouth.net>
Subject: RE: [FlyRotary] Re: EC2 Problem suggestion
Date: Wed, 18 May 2005 10:02:10 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
All it takes is a single (missed) strand of the shield (connected to the core) to create a short. 
remove the connector(s) from the EC2 and check with an ohm meter between each pin on the connector and to ground (for pins that don't go to ground) for shorts (0 ohms).
Thanks Finn. I checked that as I went, and again (twice) after everything was buttoned up.
 
realized that you used shield wires, did you shield all wires?  Don't know what type of wire you used, maybe you mentioned it somewhere.  Shielded wire can have a lot of capacitance  
I used shielded 22g aircraft wire for all EC2 inputs to the PCM (program control module) and EM2. The shield for each is grounded at the EC2 end only. Resistance measures around 0.3 ohms on each wire. The EC2 manual calls for shielding on injector and CAS wires only. Tracy suggested I shield all wires to eliminate noise. I could try disconnecting the shields if you think it might help - but doesn't that put me back in the "noise" regime? Might be a good idea. Right now a little "noise" would be kinda refreshing. :(
 
John
 
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