Take a picture of you helm and attach here, there should be push button breakers somewhere.
It's obviously a power issue so you should be able to check all of your leads to each device inside of your helm. Not to insult your intelligence but check your master helm power switch if installed. Check your connections at your power distribution block near your battery.
Everything else on the boat works. Lights, horn, motor, all gauges. Just radio, USB charge port and Garmin not powering up. Not near the boat today to take a picture of the helm. Thanks
My guess is the radio, Garmin and 12v socket are all wired to one larger amp circuit. If you get in the helm you might be able to see how the three devices are daisy chained back to a single breaker and switch. Maybe labeled ACC switch. Check connections.
You should also have a Blue Sea "Safety Hub 150" or similar distribution block/panel back by your battery(ies). Check to see if any are labeled for the circuit in question and/or pull the fuses and check none have burnt out.
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