Changed out a bunch of relays with a factory rep. on a prop jet in '72. The chief pilot took us up for a check out flight; DW went with us but wasn't sure how safe it was with my self having done most of the work.
Everything went great especially when the pilot opened the bar.
On the store/run switch while putting things back together found there is a 4 pin connector the wires go through near the relay.
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