Shore power problems at the slip almost always come from one of a few places: the dock pedestal, the shore cord and its plugs, the boat's inverter or transfer switch, or the battery charger. A tripped breaker, a dead outlet and a warm plug each point to a different one, and checking them in order tells you whether you need the marina, the dock owner or a marine electrician.
Which Symptom Points to Which Part of the System?
| Symptom | Most likely location | What you can safely check | Who fixes it |
|---|---|---|---|
| Pedestal breaker trips as soon as you plug in | Wet or corroded plug, cord, or an onboard fault | Look for water, green corrosion or scorching at the plug ends; unplug and reset only if the pedestal looks dry and undamaged | Marine electrician if it trips again |
| No power at the boat, pedestal looks fine | Cord, boat inlet, or main breaker onboard | Confirm the boat's main breaker is on and the cord is seated at both ends | You, then an electrician |
| Plug or inlet is warm, discolored or melted | Loose or corroded connection creating heat | Disconnect with the boat's breakers off and do not reuse the cord | Marine electrician before reconnecting |
| Power works but the AC panel shows no voltage | Transfer switch or inverter in the wrong mode | Check the inverter or charger display and its AC input setting | Electrician if settings are correct |
| Shore power is on but batteries are not charging | Charger fault or tripped charger breaker | Check the charger's breaker and status lights | Electrician or battery diagnosis |
| Mild tingle or shock near the boat or dock | Grounding or polarity fault | Stay off the water and out of the boat; switch off shore power at the boat if safe | Marine electrician immediately |
How to Check Shore Power in the Right Order
Work from the dock toward the boat, and stop the moment you see damage. Most of this takes a few minutes and needs no tools.
- Turn off the boat's AC main breaker and every branch breaker before touching any cord. Plugging in or unplugging under load is what pits plug blades.
- Look at the pedestal without opening it. A cracked housing, a loose receptacle, a lid that no longer closes or signs of water inside mean you should stop and tell the marina or dock owner.
- Inspect both ends of the cord. Bent or blackened blades, melted plastic, green or white crust and a loose fit all point to the connection, not the pedestal.
- Check the cord run for chafe, a kink against the seawall, or a section that has sat in the water.
- Reconnect, then switch on the pedestal breaker, then the boat's main breaker, then individual loads one at a time. If the pedestal trips at a particular load, you have found where to look.
- Check the inverter, charger and transfer switch indicators for fault codes or a wrong input mode.
Why Repeat Failures Are Common on South Florida Slips
Humidity, salt spray and heat attack the one part of a shore power system that is exposed: the connection. Moisture gets into the plug, corrosion raises resistance, resistance makes heat, and heat loosens the contact further. That loop is why a plug that was merely tight last season is scorched this one. The same salt-air mechanism affects the boat's own wiring, which is covered in our post on why boat wiring fails in salt air.
Inverters, Chargers and Transfer Switches: The Onboard Suspects
A charger that is working on shore power but a battery bank that still goes flat points to a different problem, a drain or a failing battery. Our guide to finding the drain when a boat battery keeps dying covers that side.
Shore Power After a Storm or a Surge
Floodwater and wind-driven rain are hard on pedestals and cords. If either looks wet, damaged or corroded after weather, leave the boat disconnected and its breakers off until it has been checked. The post-storm boat inspection order of checks puts the shore power pedestal and cord early for exactly this reason. Before a storm, the electrical connection is one item in securing your boat at a canal dock or slip, since a cord left plugged in during surge is a risk to the boat and the dock.
When to Call a Marine Electrician
Call for help when a breaker trips repeatedly, a plug runs warm, you feel a tingle, or the fault stays after you have checked the cord and settings. Yachts Etc works on 120V and 240V shore power systems, including inverters, battery chargers, shore power pedestals and transfer switches, and is experienced with the grounding requirements marine AC systems demand. We come to your marina or dock, so the boat does not need to move. We aim to assess urgent issues within 24 hours, and electrical failures get priority scheduling. Simple repairs such as fixing dock power typically take one to two days. You can request a marine electrical quote to describe what you are seeing.
FAQ: Shore Power at the Slip
Why does my shore power breaker keep tripping?
Repeated trips usually mean current is leaking to ground or a connection is wet or corroded. Try the cord on another pedestal and unplug loads one at a time. If the breaker still trips, stop resetting it and have the system tested.
Is it safe to swim near a boat with shore power connected?
Not if you have any doubt about the wiring. Faults in grounding or polarity can put current into the water around a hull, so swimming near a plugged-in boat with a known or suspected shore power fault is a risk you should not take.
Who owns a pedestal problem at a private canal dock?
The pedestal normally belongs to the dock owner, so repairs to it are theirs to arrange. Your cord, boat inlet and onboard wiring stay with you. A neighboring pedestal test shows which side is at fault.
Can shore power repairs be done while the boat stays in the slip?
Yes. Most electrical work can be done with the boat in the slip, since only below-waterline repairs typically require hauling out. Mobile service means the electrician comes to the boat.
What should I do with the cord when I leave the boat for a while?
Decide deliberately. Leaving the boat on shore power keeps the charger and bilge systems working but exposes the connection to weather, so inspect the plug ends each visit and treat any discoloration as a warning that the connection needs replacing before it fails.