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Self excited SD-8 grounds

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Tailwind1

Joined: 05 Sep 2020
Posts: 7
Location: GREYBULL, WY

Posted: Wed Nov 18, 2020 4:01 pm Post subject: Self excited SD-8 grounds

I am wiring an SD-8 permanent magnet alternator using Z25 for the self-excitation feature,



Regarding the grounds for the diode bridge (note 25) and the on/of switch controlling the relay, are there any reasons why using local grounds (instrument panel structure bolted to a tubular airframe) will create problems or should I run the ground wires to the “forest of tabs” on the firewall (also grounded to the tubular structure)?



Also, how much current is carried by the diode bridge ground (what size wire required)?



Looking to avoid extra ground wire runs unless really needed for noise or reliability.



Thanks, Tim

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Flying Sonerai II with A80 Continental. Wittman W10 Tailwind under construction, O360, dual LSE electronic ignition, airframe complete and covered, engine hung, cowl built. Working on electrical, instrumentation, and other details.

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