by Jim Isaacs » 6 days ago
Not listed, but I’m assuming you pulled each breaker or removed each fuse while running at idle speed to try and isolate a system as the possible cause?
Also, did you try briefly disconnecting your engine electrical power (“alternator’j output power at your power bus (e.g. pull the bus breaker) while idling, did that make any difference?
Also, when checking each wire for resistance or voltage, did you check each ground wire to ensure no voltage was present? I’d do both battery power only and again with engine running at idle speed.
Also, the wires from your ignition modules to your cockpit switches are separate, not a twisted pair, and shielded, with the shields terminated at both ends of each wire (module and cockpit switch)?
by Rotax Wizard » 6 days ago
Hi All
What Jim suggests is a good idea. Have a look at the requirements in the installation manual, IM.
In my experience the most common problem is the failure to shield the wire and running it near a high tension (spark plug) wire. It picks up the electrical field and gives you that static that follows your RPM. Check the point of where it comes from the modules and how they are routed from that point into your cabin.
Cheers
by Roger Lee » 5 days ago
You may just have a ground loop
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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