Electricity and water don't mix. But electricity and gasoline fumes are even worse.
This is why the number one rule of marine electrical is Ignition Protection. Here is how to keep your system safe and ABYC compliant.
1. Alternators: Marine vs. Automotive
We often get asked: "Can I use a cheap alternator from an auto parts store?"
The answer is NO.
A Marine Alternator is screened (Ignition Protected) to prevent sparks. If you use a car alternator in a gasoline engine room, a single spark can ignite fuel vapors in the bilge. Do not risk your vessel to save $50. Always install marine-rated units (like Balmar or Arco).
Shop Ignition Protected Marine Alternators
2. Battery Management: The Selector Switch
If you run your stereo all day at the sandbar, you need a way to ensure your engine battery stays charged. Enter the Battery Selector Switch (1-2-BOTH-OFF).
- OFF: Prevents battery drain when the boat is stored.
- 1 or 2: Isolates the "Start" battery from the "House" battery.
- Combine: Links them for emergency starting power.
Browse Blue Sea & Perko Battery Switches
3. Shore Power: The Connection
Connecting to the dock requires heavy-duty gear. A damaged Shore Power Cord is a fire hazard. Check your plugs for burn marks (arcing) annually. If you see browning around the prongs, replace the cord and the inlet immediately.
