Quote:
Originally Posted by Tommycat
.But it seems to me that the most recommend one is the return ground thru wire shield. As per this diagram...
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I'm not one pf those people.....
The long term durability of the P lead shield is vulnerable depending on how it is actually completed (There is strong evidence that first time builders don't always have a good idea what to do here). This then makes it highly likely that at some point in the future the airplane will have an unsafe mag because of a failed grounding path. It is for this reason that I promote sheild connection at one end only and then use an airframe connection to the switch ground as the grounding source.
None of this is relevant to the O.P.'s problem though because the ground is used to disable the mag, not enable it.
Even if the ground it hooked up incorrectly, as long as each P lead is connected to the switch properly, the mags should fire the plugs (but it may cause an unsafe condition by not disabling the mags when the ignition is off).