Again, my contention is that you are better off checking one mag at a time, to
verify the mags ground out properly, and then check the off position of the switch
using an ohmmeter rather than causing the engine to backfire.

The other alternative I guess is to leave the switch in the off position once you
put it there, let the engine shut down completely, then restart it and shut it down
normally.

Dave Butler wrote:

Ray Andraka wrote:
Why,

If you check the left and then the right mag, you know that both of them will
ground out properly without risking damage due to a backfire. The only thing
that individually checking the mags won't find is a switch that is defective
in the off position only, pretty unlikely. If you are that paranoid about the
switch, you can check it with an ohmmeter with the engine stopped.

Many (OK, some) ignition switches have an AD with a recurring inspection
requirement that requires testing the OFF position every 100 hours. AD 76-07-12


Orval Fairbairn wrote:


Very unlikely -- all the P-lead break does is prevent you from shutting
down that mag. It is a good idea to pefrorm a "both off" check when
doing a mag check. That way, you will be able to find a broken P-lead.


--
--Ray Andraka, P.E.
President, the Andraka Consulting Group, Inc.
401/884-7930 Fax 401/884-7950
email
http://www.andraka.com

"They that give up essential liberty to obtain a little
temporary safety deserve neither liberty nor safety."
-Benjamin Franklin, 1759



--
Dave Butler, software engineer 919-392-4367

--
--Ray Andraka, P.E.
President, the Andraka Consulting Group, Inc.
401/884-7930 Fax 401/884-7950
email
http://www.andraka.com

"They that give up essential liberty to obtain a little
temporary safety deserve neither liberty nor safety."
-Benjamin Franklin, 1759