The small box turns out to be a glow plug controller. Found a new one on eBay but could not find a matching connector so I ordered the entire harness. In the meantime I crimped spade connectors on the wires and plugged them in. Still no luck in getting power to the starter system. With help we found that there were two splices down in the bilge that were corroded. Replaced them and everything is now working. Thanks for the feedback.
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