1. The Clarion remotes are basically plug & play. As I recall, to hook them up there's a 'din' connector (Large roundish connector a lot like the old IBM Keyboard connectors) and two wires for the gauge light. To have two remotes, each of the din connectors plugs into a Y adapter at the back of the head unit. As you imply both are not working, I'd start by looking for a loose Y adapter connection to the head unit.
2. Your priming issue theory sounds good, but I'd be very surprised if FW used a pump that wasn't self priming for the sink. My thoughts would be to look for a clog, loose connection, or leak in the hose on the suction side.
_________________ 2007 Horizon 200
4.3L GXi/ SX 225 HP
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