Posted: 9/23/2009 13:03:39
Please could someone explain exactly how I should wire up my ignition system? I have an EIS system on the right and the wiring is OK. On the left I have the original impulse magneto supplied with my IO360 180hp.
In particular, what awg shielded wire should I use? Grounded at both ends? I'm building a composite Glasair.
Is there a reference book or instruction manual available, or a website that shows you how it is done? I am using a toggle switch for the ignition.
Posted: 9/24/2009 20:23:31
Modified: 9/24/2009 20:26:03
I have the Glasair 2-S manual here and there is a primary wiring diagram. (Volume II, page G 282) To answer your question, a 20ga shielded wire, with the shield grounded on one end. Your toggle switch will have one side run to an airframe ground buss and ground the mag and prevent it from firing when in the "on" position. You should have a heavy ground strap run from the engine to the motor mount and another from the mount to the ground buss inside the airplane. A frequent source of electrical problems in composite aircraft is poor grounding of the complete system.
Posted: 9/25/2009 02:58:41
Thanks, Neil. That's great and confirms what I had thought. I've never had any dealing with magnetos before and it just seemed too simple. Safe flying!
Posted: 10/15/2009 15:06:03
The shielded wire for mags should get grounded only at the mag end. This and all other wiring issues are covered extensively by Bob Nuckolls on: http://www.aeroelectric.com
Posted: 10/15/2009 15:17:17
Thanks Don! I'll have a look at aeroelectric.com straight away.