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New to Cobalt and loving it. We are having electrical issues on our 2016 r5 like Captains Call not working with switch, horn not working, radio not functioning correctly (new unit), trim tabs not working, gauges coming in and out( trim/fuel more than speed/tach) . Can anyone please tell or show with pictures where the grounding blocks might be. Any information would be greatly appreciated.

The grounding block should be mounted on the inside wall of the transom. Should see a heavy gauge cable (2 awg?) going from it to the engine. The 2 neg battery cables are most likely going directly to the engine.