You’re out on the water—and your systems fail. What now? Before heading out into the water it is important to have an understanding of common electrical issues. With over 20+ years of dedication and experience, Marks Marine Electric are experts at diagnosing electrical problems.
Common Electrical Problems
Some of the most common electrical problems to keep an eye on are:
Dead or Failing Batteries
Signs: slow starts, dim lights.
Faulty or Corroded Switches
Importance of clean, functioning switches.
Saltwater damage issues.
Pump Failures (Bilge, Livewell, etc.)
Strange Noises such as grinding, whining, or buzzing could mean internal damage or clogging.
Weak or No Water Flow – A strong pump will have steady flow. If it’s sputtering or barely moving water, it’s struggling.
Pump Cycling On and Off Rapidly – This could signal a wiring issue, pressure switch failure, or a short.
Visible Corrosion or Water Damage – Especially around electrical connections—saltwater is brutal on gear.
Pump Won’t Turn On at All – Could be a blown fuse, bad switch, or a dead motor—but it shouldn’t be ignored.
Basic checks boat owners can do:
Use a multimeter to check voltage – 12.6V or more = fully charged, 12.4V–12.5V = moderate, 12.2V or less = needs charging or inspection
Visual Inspection of Wiring – Be on the lookout for corrosion or green/white powdery buildup, frayed, loose, or exposed wires or melted insulation or burnt smells
Some things are best left to a marine electrician—especially when safety, complexity, or system performance is on the line.
Call us today if…
- You notice repeated electrical issues (e.g. fuses keep blowing, equipment keeps shutting off).
- There’s significant corrosion or melted wiring.
- Your battery isn’t charging while underway (possible alternator issue).
- Multiple systems are malfunctioning—could be a bigger wiring or grounding problem.
- You’re planning to upgrade or install electronics (navigation, lighting, radios, etc.).
- Pumps or generators make unusual sounds or stop responding entirely.