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Magneto switch ground

I have a1950 SC with an A7 mag switch. The ground lead to the switch does not have continuity to ground, The switch checks fine.
Does the ground lead in the harness, ground at the mags? I tried continuity at the mags and airframe ground no luck.
I assume the wire is broken between the switch and the mags.

Thanks
 
Check for continuity from the ground tab on the switch to the case of each mag. Shielded P-leads? What type of terminals at the mags? Any type of filters or feed through capacitors added into the P-leads?

Web
 
With the key in the off position does R and L on the back of the switch read Gnd?
 
Found ground contact on mag was not making good contact. Removed the switch and cleaned contacts and repainted.
Thanks for the advice.

Joe
 
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